Well, I'm not in a top 100 guild by any means...but my guild gets heroic mode fights down using fewer healers than typical guilds (largely due to lack of recruiting options on my server, but it makes things more fun for the few of us).
This seems to be what I've found through my experiences and for my playstyle (again, not a top guild, but my name appears in many top100 EHPS rankings on WoL for whatever that's worth): Seal of Wisdom is the cornerstone for effectively playing a Paladin and is generally what sets my performance apart from other Paladins we've attempted to recruit in the past. Here are some of the finer points:
(note that most of these apply during non-insane healing periods; when shit hits the fan, you always mash that Holy Light button like a champion)
1) While in melee range, Holy Shock on cooldown. You will get 2-3 auto attacks during the casting of this instant spell (doesn't reset swing timer) which translates to ~2k mana. Holy Shock heals for 50% of a Holy Light, but you basically gain 1300 mana each time you cast this spell (not counting Illumination on crits) and it has the potential to slightly increase throughput of your next HL.
2) Shield of the Righteous procs Seal of Wisdom. This often goes overlooked. Everyone uses Judgements to proc SoW, few use SotR. During things like the air phase of Sindragosa, there is no reason not to SotR on cooldown and get yourself back to 100% mana without using Plea.
3) Often times, it's better to BURST your regen on encounters with tough phases and slightly more lax periods. Here's what I mean: get in melee range of the boss, Divine Plea, SotR on cooldown, Judge on cooldown, toss a Holy Shock when needed, refresh SS and Beacon between SotR/Judge (so that this downtime isn't totally wasted and since these won't reset your swings), pop your haste glove enchant if you're an engineer (14% melee haste for 10s). During this brief window of time, you can gain (I shit you not) 25k mana if your buffed pool is 36k.
It should be noted that Divine Plea only makes up for 9k of that 25k, which means that you can do this any time you want and still grab yourself 16k mana while maintaining some raid heals and refreshing utility spells.
4) The infinitely sustainable rotation. It's basically just HL, auto swing, HL, auto swing, Holy Shocks on cooldown. HL costs ~1100 mana, auto swings generate ~800 mana and auto swings during Holy Shock generate ~1600 mana. You will not dip under 95% mana with this rotation.
5) Your BiS weapon is whichever current tiered weapon happens to be the slowest. Weapon stats DO NOT MATTER as long as it's a caster weapon obviously.
Let's look at a 1.6 healing mace and a 2.2:
- 1.6spd has a 40% chance on swing/judge/SotR to proc Seal of Wisdom.
- 2.2spd has a 55% chance. That basically translates to a 37.5% increase in mana gained via Seal of Wisdom since you never just sit there auto attacking, you only swing between casts or during instants.
BQL this week had me @ roughly 60k SoW mana for example. My weapon speed is 1.8 (random loot is random). If I had access to a 2.2 speed weapon, you could likely bump that 60k up to 73k. The fight was 5:30 and as such, this simple swap to an identical weapon stat-wise with 2.2spd would represent a gain of
200Mp5. If my numbers had been generated with a 1.6spd weapon, the swap to 2.2spd would represent a gain of
340Mp5.
If we had access to 2H healing maces, you could expect to rock out numbers in excess of 1800 Mp5 from general SoW procs, Judgements, auto-swinging through instant casts, etc. Right now limited to 2.2spd weapons, expect to see numbers closer to 1200.
Weapon Speed is your strongest regen stat and costs zero itemization points
Putricide this week for example had me @ ~185,000 mana gained over the course of 8.5 minutes, 88,000 from Seal of Wisdom alone. This doesn't include my passive ~600 mp5 which would be another 61k mana. Divine Plea was only used one single time during this 8.5 minutes during the first Tear Gas. Keep in mind this is a movement intensive fight and Seal of Wis uptime isn't huge. My EHPS peaked around 15-16k during P3...but due to the other healers being 2x Resto Druids, Resto Shaman, Holy Priest...my EHPS was only 5.5k overall, those guys don't leave much for me to heal during P1 and 2
This means that
[Lockjaw] is likely BiS for this expansion since most Spell Power ends up as overhealing...you'll lose 150 Spell Power from
[Bloodsurge, Kel'Thuzad's Blade of Agony] and a few stats, but you gain ~200-250 Mp5 from the weapon's speed increase. Then again, if your guild is downing LK25H, what the hell do you need to min/max for anymore anyway? Also if your guild is downing LK25H, you've definitely got so much int/haste/crit/mp5 that you probably don't even need to look at your mana bar anymore. 200 Mp5 won't affect you whatsoever.