Well, the real question (at least for Disc) will be what happens to multiple Flash Heal crits. Will the later crits override, or will they stack and start rolling (like Blessed Resilience).

I think it might've been mentioned before in the thread but I just wanna know if haste would be more valuable than crit as a (raider) disc priest? How does it actually work because I've heard some different things that haste is what "every disc priest wants, more than crits" and some that say crit is better than haste.

Is it okay for a disc priest to have 533 haste rating and 22% crit?

As ever with these kinds of questions it depends on the encounter design, your healing designation, and your playstyle. In general Haste gives better throughput than Crit but it also hurts your HPM and it's very easy to get yourself GCD capped when BT is up. I've taken to nearly always using BT up on GH instead of FH which solves this problem nicely and let's me carry on stacking Haste since I have absolutely no mana problems and I prefer the flexibility and predictable output that it offers over Crit.

But you do want to keep your Crit up becuse DA and Inspiration are nice. I don't think I'd want to let mine drop much from what it is now (509 haste & 29% Holy Crit). Your profile links to a Hunter so can't offer anything more specific for you.

Crit and haste are both very bad for disc. Stack spell power. If you have to pick and choose, take a minimal amount of haste, up until you hit the GCD cap with borrowed time up, then use crit - but keep in mind that you should be stacking spell power over absolutely everything.

Does anyone have any math or an opinion for Holy Conc vs Healing Prayers? Either that one is always better or that Healing Prayers becomes better after so many PoH casts ect. Ignore the fact that one is more talent points, and assume 6 min fight, ~30% crit and ~400 mp5 from spirit (raid buffed.) I realize that Holy Conc up-time is based heavily on play style, and that the same applies for mana reduction on PoM, I'm not asking for an exact science just a general idea. I'm not interested in being told that I should have both.

I'm having a hard time seeing why you'd want to drop either? I doubt the actual trade off you are making is between these talents but between some other talents, most likely trying to fit in Body and Soul(I usually drop SoL to 1/2 and Blessed Resilience to 2/3 for this) or empowered healing, which I personally would never pick up since even with a flash-over-renew playstyle it's still just taking a raidbuffed flash heal from 5-6k to 6-7k, hardly worth 5 talentpoints in any scenario.

I dropped Healing Prayers a long time ago and haven't had mana issues. In fact, I've even dropped my [Insightful Earthsiege Diamond] for [Revitalizing Skyflare Diamond] and haven't noticed it. In theory, Holy Concentration is better because it scales with your spirit while Healing Prayers does not. And Healing Prayers is only useful if you're casting Prayer of Healing, which doesn't see a lot of play in the current raid tier. On a side note, I'm a strong believer in 2/2 Surge of Light and 3/3 Blessed Resilience. I would need a very compelling argument for why 1/2 is the correct choice, especially since Tournament fights require so much movement.

To be clear, I'm suggesting you cut 2 points from Healing Prayers and 1 from Inner Focus to max out Blessed Resilience and Surge of Light. If mana isn't a concern, then this is absolutely the right choice. Maxing Surge of Light doesn't pigeon hole you into single target healing. It's just one more spell you can cast while moving.

Regarding Prayer of Healing, I understand it has its uses, especially with Serendipity. I'm just questioning whether it's cast enough that it's worth spending 2 talent points for -20% mana reduction. I suspect that's not the case.

As said current content doesn't really challenge raidhealing, even twins has with practice become effectively just a matter of resto druids keeping hots up and the resto of us trying not to look too useless. However when we were still learning Twins and people were taking spikey damage, PoH was still doing 20-35% of my healing, only rivaled by CoH. I'll gladly agree that if you're doing nothing but casting PoM, Renew(imo easily better than SoL Flash when moving) and CoH, then you don't need the mana efficiency talents. You also don't need to be there, that place would be better filled by a druid.

I suppose you could accuse me of gearing for the next tier of content. You'd probably be right.

I guess my experience learning Twin Valkyrs was different. The damage was rarely so evenly distributed in groups that a Prayer of Healing was the right choice, and when you are soaking orbs, you might not have the luxury of stopping moving at that exact moment. Many times people were already mostly healed up before my prayer of healing could land. Looking over the parse from our very first kill, my healing breakdown was 32% circle, 32% renew, 29% mending, 7% everything else. I was competitive with the resto druid who was soaking, as well as a non-soaking paladin and shaman. Obviously we're blown out of the water by a non-soaking resto druid but what can you do. Here's the parse:

World of Logs - Real Time Raid Analysis

Regardless, even if you were using Prayer of Healing on that fight, taking the mana reduction talent only makes sense if you would have run out of mana without it. I just don't see how that could be the case. If you are soaking, there are fewer opportunities to cast prayer. If you aren't soaking, you should be casting holy nova instead (and glyphing it).

Similarly, if you aren't using Surge of Light at all, then don't take 1/2 points in it. Go to 0/2 and max out Blessed Resilience. The second point in Surge of Light is exactly as good as the first, so the only real options are 0/2 and 2/2.

The same stack of mana pots that I bought the day before heroic ToC release is still in my bags, untouched. I only use shadowfiend because he does damage. Both of these seem like good reasons.

Renew is better then flash in terms of HpM, but renew doesnt save people who are about to die. I use renew over flash when applicable, but having flash heal for a lot is a good thing. On a side note if I was having mana troubles empowered healing would be the best place to steal points from.