This is a posting I made in my Guild Forum about the effects of the change of the new Watershield. Criticism is welcome.
IMO, the changed water shield (helped by a small buff of the Manaspring totem) has dramatically changed the importance and weight of the stats - one that will apparently be strengthened even more in 2.3.2
erstärkt wird.
The new water shield gives a semi-passive Bonus of at least 50 Mp5 if you recast it every Minute. The Manaregen can be even more - but only if all three charges are used up in one Minute - before the watershield fades by itself (if only 1 or 2 charges are used up, the Mana gain is the same as if no charges had been used). The Manaspring Totem was also buffed, now giving an equivalent of 62.5 Mp5 (instead of 37.5). Both together means a buff of at least 75 Mp5 in comparison zo before 2.3
As things currently stand, the water shield will be strengthened even more in 2.3.2. It will no longer have to be recasted every Minute, instead it will give a passive 50 Mp5 bonus as long as it is active. This means that every used up charge gives additional Mana-regen in comparison to 2.3.
As an example, if one charge is used up every 25 seconds you have the following Managains:
Before 2.3: ~110 Mana per charge -> 22 Mp5
With 2.3: 2 charges of about 200 Mana + 1 charge after one Minute is done -> 50 Mp5
With 2.3.2: 50 Mp5 passively + about 200 Mana every 25 seconds -> 90 Mp5
What does this mean? Very simple - you need a LOT less Mp5 on your gear than before. conservatively speaking, you need 75 Mp5 less dann before 2.3 in order to have the same effective Mana-regen. This allows us to concentrate less on Mp5 and more on the other stats.
This is even more apparent when you consider that Mp5 is the easiest stat that is pushable without equip. Drinking Manapots every CD gives you about 100 Mp5 (140 with the Alchemist's Stone), looking at various WWS reports a SP usually gives me about twice as much as the new water shield - another 100 Mp5. Additionally you have BoW (41 Mp5 untalented), Flask (25 Mp5), Mana oil (14 Mp5) and the buff food (8 Mp5). Altogether that is around 290 Mp5 only through consumables/SP. Factoring in the water shield (50 Mp5), Manaspring totem (62.5 Mp5), One Manaflood totem every 5 Minutes (at least 40 Mp5 if you have 10k Mana - extremely conservative) - a total of about 440 Mp5 (480 with Alchemist's stone) without factoring in any equipment. This means that our equipment (I had about 170 Mp5 before 2.3) is less than one third of our total effective Mp5.
Now the question is on what stats to concentrate now that we don't need as much Mp5. There are three stats which are possible: pure +healing, spellcrit, and spellhaste.
First lets compare sellcrit and spellhaste. Luckily we have to items which are easily comparable in order to look at the costs and benefits of using spellhaste rather than spellcrit.
Spellhaste: Item Lvl 138:
[Dark Blessing] -> 30 Spellhaste = 1.9% faster casttime, or 1.9% more healing and 1.9% higher mana costs.
Spellcrit: Item Lvl 141:
[Hammer of Atonement] -> 23 spellcrit = 1.04% chance for 50% more healing, or 0.52% more healing with the same mana costs.
As we see, Spellhaste is a lot more effective in comparison to spellcrit - especially when you consider that we usually are raid healers, which requires us to put as much heal as possible on different people - something which is better done through several smaller and faster heals than with a few possibly larger but slower heals. Additionally, the CH is semi-intelligent, always jumping to the target that is missing the most life - also benefiting faster heals rather than larger heals. Lastly, the only benefit (in addition to healing more for the same mana cost)of critting our heals is the 25% Armor buff - which usually only helps the MT/OT - who most of the time are not the focus of our healing.
In summary: Spellcrit is completely ignorable.
(Note: Please check the Math in the next part, as I am not entirely sure how the various talents factor into the effective healing and the manacosts. I assumed they were all multiplicative)
As a basis for comparison between +heal, spellhaste, and Mp5 I assume a total of 2k +heal - I am completely ignoring crits and I am also completely ignoring the stat cost on items.
Chainheal gains 125% of our +heal (divided up into all three jumps). Additionally you receive a bonus of 10% on all heals and another 20% on ally Chain Heals. I am ignoring the Tier 6 4-piece bonus.
Chainheal 5 with 2k +heal averagely heals for: 1547+2000*1.25*1.1*1.2=4847 life.
Chainheal 5 with 2.1k +heal averagely heals for: 1547+2100*1.25*1.1*1.2=5012 life.
In other words: 100+heal = 165 more healing. Note: it doesn't matter how much +heal you had before - 100+heal always adds another 165 more healing to CH 5.
100 spellhaste means that you cast 6.37% faster, or rather that you heal 6,37% more while also using 6.37% more Mana. Again using 2k +heal as a basis:
Chainheal 5 with 2k +heal and 6.37% faster casting results in you averagely healing 4847*1.0637=5156 in 2,5 seconds.
In other words: 100 spellhaste = 309 more healing. Note: Spellhaste is multiplicative - the more +heal you have, the more effective it is.
To have a realistic comparable value between Mp5 and +heal is a little harder. To make this easier, I am assuming that all the additional Mana you receive will be used up for healing. Again using 2k +heal as a basis, you receive the following HpM values (factoring in the 5% cheaper heals, again ignoring the Tier 6 Bonuses):
540*0.95=513 Mana per CH, or 4847/513=9.45 HpM.
Chainheal has a cast time of 2.5 seconds - taking 100 Mp5 as a random amount (it doesn't matter for the comparison) this results in you having regenerated 50 Mana in the time you cast the Chainheal.
This means you could heal for an additional 50*9.45 = 472.5 Life.
In other words: 100 Mp5 = 472.5 more healing. Note: Mp5 benefits from +heal - the more +healing you have, the more effective it is.
Comparing all the values you receive: 100 spellhaste = 187 +heal = 65.4 Mp6
Rounded you have: 3 +heal = 1.5 spellhaste = 1 Mp5 = 10 Int.
(This is only factoring in the Int-> spelldmg/healing Talent, no manapool, no manaregen, no crit)
I want to reiterate that this is only meant for raids with the respective Buffs and support possibilities. Additionally, you have to fit your equipment to the respective fight - the longer the fight is (and the less support you have with your manaregen), the more Mp5 gets. Obviously you will need to use a lot more Manapotions than before - however your healing output should be a lot higher than before.
Following the the values I got above, I ranked the equipment/enchants available in BT and ZA. I left out Tier 6, because the bonuses(and therefore the items) are a must have. Once you have all five pieces, you can switch out the gloves (there the difference is the largest, closely followed by the legs):
Gems:
[Teardrop Crimson Spinel]>
[Royal Shadowsong Amethyst]>
[Luminous Pyrestone]
Enchants (only those which have non-obvious choices):
Schoulder:
[Greater Inscription of Faith]>
[Greater Inscription of the Oracle]
Chest:
Enchant Chest - Restore Mana Prime
Wrist:
[Formula: Enchant Bracer - Superior Healing]>
[Formula: Enchant Bracer - Restore Mana Prime]
Weapon:
[Formula: Enchant Weapon - Major Healing]>>
[Formula: Enchant Weapon - Spellsurge]
Head:
[Helm of Soothing Currents]>
[Guise of the Tidal Lurker]>
[Mojo-mender's Mask]
Schoulder:
[Living Earth Shoulders]>
[Hex Lord's Voodoo Pauldrons]>
[Cataclysm Shoulderguards]
Chest:
[Hauberk of the Empire's Champion]>
[Golden Links of Restoration]>
[Cataclysm Chestguard]
Wrist:
[Living Earth Bindings]>
[Howling Wind Bracers]>
[Gleaming Earthen Bracers]
Gloves:
[Botanist's Gloves of Growth]>>
[Gloves of Unfailing Faith]>
[Polished Waterscale Gloves]
Waist:
[Belt of Primal Majesty]>
[Man'kin'do's Belt]>
[Girdle of Fallen Stars]>
[Cord of Braided Troll Hair]
Legs:
[Leggings of Eternity]>
[Sun-touched Chain Leggings]>
[Kilt of Immortal Nature]>
[Achromic Trousers of the Naaru]
Shoes:
[Two-toed Sandals]>
[Treads of the Life Path]>
[Stillwater Boots]
Schields:
[Enamelled Disc of Mojo]>
[Bastion of Light]>
[Aegis of the Vindicator]
Weapon:
[Crystal Spire of Karabor]>
[Dark Blessing]>
[Lightfathom Scepter]>
[Shard of the Virtuous]
Rings:
[Blessed Band of Karabor]>
[Signet of the Quiet Forest]>
[Band of the Eternal Restorer]>
[Band of Eternity]
Necklace:
[Brooch of Nature's Mercy]>
[Nadina's Pendant of Purity]>
[Lord Sanguinar's Claim]>
[Emberspur Talisman]
Cloak:
[Shroud of the Highborne]>
[Cloak of Ancient Rituals]>
[Shroud of the Final Stand]>
[Stainless Cloak of the Pure Hearted]
[EDIT]Removed Glove enchant.