No, because the calculations for DP on CD include Replenishment and (sometimes) Arcane Torrent.

It is massively overbudgeted, I think that was found in the ilvl thread. But so are a number of other items like [Illustration of the Dragon Soul] I don't think you can really count on items being nerfed to fill appropriate item budget. And as was pointed out earlier in this thread, These trinkets are currently BiS for both HL and FoL specs.

I think you're misinterpreting what I meant by DP-on-CD. 33% of the mp5 that is gained exclusively from DP. Not using DP on CD doesn't effect any of the mp5 gains from replenishment or torrent.

128 Int -> 154 Int -> 2310 mana
DP Value on CD: 48.1mp5 (2310*.25/12)
Arcane Torrent (If applicable): 5.8mp5(2310*.06/24)
Replenishment: 23.1mp5

DP'ing every 3 min: 16mp5 (2310*.25/36)

Fully raid buffed, we have so much haste that it starts to get into the area where you can't really consider it a stat that helps spells land earlier. Even at low levels of haste, say 300, you're at 35.8% total haste for a HL cast time of 1.47 seconds. Adding 100 haste puts you at 39.6% total haste for a HL cast time of 1.43 seconds. That's a lot of haste just added for only a 0.04 second reduction in cast time. Not something you are going to really notice if you are looking for your heals to land earlier. Haste is really more of a throughput stat, where you are spamming as many heals as you can over a period of time. That small reduction in cast time or GCD adds up to an overall increase in healing output over the course of a fight.

As for the soft cap, I don't really see any harm in going over it. Even when the GCD and FoL gets capped at 1 second, you still are dealing with human and computer latency. Assuming a general 0.1 second lag, a 0.9 second FoL cast isn't going to get wasted too much on GCD clipping. To get there, you'd need 66.7% total haste, 34% haste from gear, or 1,112 haste rating. As just another point of reference, 881 haste rating would give you a 0.95 second FoL cast, which is probably a more reasonable number to aim for if you are trying to get capped when taking latency into account.

My current gemming strategy is to maintain around 32k-33k mana fully raid buffed, and then gem for sp/haste. I like the hybrid gems because you get slightly more SP per item budget. So I'm going red or yellow socket with 10 haste, 12 spell power. The blue sockets get 10 haste, 5 mp5. If I start dropping lower on mana than where I want to be, I throw in a few more int gems.

It really depends on how much mana you have. I like to stay above 31k, preferably around 32k-33k mana before stacking haste. Crit really is a low priority stat now so try to avoid it where possible. Go for haste/crit or haste/mp5 gear, while avoiding crit/mp5 when possible.

As for non-tier: choose either the chest or the legs.

Non Heroic:
[Breastplate of the Frozen Lake] from Twin Val'kyr is your best chest option from TotC, and [Legplates of Failing Light] from Lord Jaraxxus is your best leg option from TotC. If crafting the chest is something you can do, then [Merlin's Robe] and the tier legs is the best option.

Heroic (not counting iLvl 258 tier):
Either using [Breastplate of the Frozen Lake] or [Legplates of Failing Light] will give you almost identical stats. The chest from heroic Twins is slightly better because you get 6 more haste instead of crit. However it's a bit easier to get the legs from heroic Jaraxxus atm.

Let's be honest though, the highest damage peaks on hard mode ToC are very predictable phases of a fight which can in fact last longer than a DP cooldown. You still don't DP during that period because the probability of tank death would still be too high. However there are other parts of the fight where the damage is moderate which affords DP'ing on CD. Combining both, you're likely NOT hitting DP on CD for some of the hard mode ToC fights in the interest of curbing tank death risks.

Also, recommend against AW'ing during DP. 60% healing is really not much better than 50% in the grand scheme of things.

Here is how I calculate the regen value of INT:

10 INT = 180 mana with kings
1.8 mp5 from replenishment
3.8 mp5 from DP used on cooldown
0.5 mp5 from arcane torrent used on cooldown
2.4 mp5 assuming 4 JoW procs per minute
0.7 mp5 from illumination from crit assuming 12 mp5/1% crit (chain casting HL)

Therefore, 1 INT=0.92 mp5 for Blood Elves and 0.87 mp5 for non Blood Elves.

When you have beacon up, you get a stack for the initial cast, and then an additional cast for the beacon copy of that cast. I have yet to see casts add 3 or 4 stacks, but 2 is what should be happening for you as a paladin. Due to this, the on-use is closer to 180mp5 if used on CD under best case scenario.

I think that really depends if you feel pressed for mana regen or not. As usual, choosing between these items falls under "your personal scenario" as to which you would prefer based on how you play. I chose the plate leggings because I don't feel pressed for mana in hard mode ToC and I don't want to completely throw crit by the wayside because metorite crystal + DI + FoL spam affords some excellent regen.

If I were running with one holy paladin only (we use 2) and the tank healing burden was solely on my shoulders, then I'd probably lean towards the mp5 mail leggings and definitely more mp5 over crit throughout my set- plate or not.

I've found that with a high enough mana pool, you will get enough MP5 from BoW, DP, replenishment, judgements, mana tide, etc that you don't have to worry so much about MP5 on gear. It's always a helpful thing to have, but you can manage fine without it. Still, always go for haste/mp5 over crit/mp5. No matter what, you are going to end up with at least a few pieces with MP5 on them. My rule of thumb is just to go for gear with haste on it. If it's haste/mp5 or if it's haste/crit I don't really care. Then use your gem slots to fill in any gaps that you find in your playstyle. If you find yourself straining for mana in fights gem for Intellect. If you have no problems with mana, start gemming more for haste and spell power. Spell power isn't as useful as haste, due to the fact that most of our heals waste it on overhealing. But it still does increase the SS absorbs, will give larger FoL heal over times, and gives a little more to HL splashes.

I don't really expect to notice upgrades (other than the increased mana, which is nice). We just have to believe that on average haste makes our tanks die less.

I'm talking about a situation where you don't need to throttle holy light usage or use DP on cooldown. I don't use DP on cooldown in anub ph3 because I don't need to, even when I'm spamming as hard as I can. However, having SotF instead of the Talisman might be the difference between needing 0 or 1 or 2 DPs. If you calculated things using DP-on-cooldown, you would end up calculating 3 DPs and that will make the Talisman look better than it ever would in a real life situation.

This is what I'm going to do: I'll try to replace my Talisman with the 245 version of SotF.

No. They're the BiS. People talking about other legs are arguing based on their own preference and/or arbitrary stat limits they want to stick to.

Never cast FoL with DI. It will benefit you less that way. Try to use it when you have to refresh beacon or time it so that you can use it as many times as possible in a fight.

Gearing choices like those legs are generally based on Holy Light specs, and not SP oriented builds. The [Legplates of Failing Light] are BiS plate legs for both HL and SP builds, but the mail legs outpace them in a traditional HL build.