While it's true that you don't need 5 tanks for 25 men raids, having a similar ratio of healers:raid-size for 5, 10 and 25 raids is a still a good thing from a guild-roster POV. The niche roles of healing is a concern, but it's more of a 10-men raid one, since you only have 2 healers in such raids.
Considering there are 4.5 specs of healing (haven't raided with disc priests myself), 6 spots doesn't sound too bad. Compare this to DPSers, which have 15-17 raid slots, that's more or less a slot per DPS spec.

Blue dragon - nerf it already. Can't say I'm fond of pure-regen trinkets, but this item has got to go.

We haven't tried Sartharion with drakes up yet.

That said, I'm using:
[Majestic Dragon Figurine]
[Spirit-World Glass]

I stopped using MP5 and Spirit consumables because my regen is a little high. I switched to Frost Wyrm flasks and Firecracker Salmon. I agree with previous posters here. I just haven't encountered many situations where I was really in fear of going OOM. The only possible exception has been our first couple of Malygos kills where I was pushing it to make sure nobody died and probably overhealing. Even then, Innervate was way more than enough. Once I'm more fully decked in 25-man T7, and fill in a few more slots with BIS gear, I'll be regemming to spellpower or +int gems as well. I would love an Illustration trinket later as well. But we're giving those to our DPS casters first it seems.

You have 1000 mana regeneration.

Intensity sets you at 30% of that working in combat (300 MP5).
Innervate sets you at 100% (1000 MP5) and then adds an additional 400% (4000 MP5) to give you a final total of 5000 MP5.

Blue Dragon proc sets you at 100% (1000 MP5)
It doesn't "give you an extra 100%" regeneration.

I don't think it's correct InSaen because I believe you are overestimating the proc rate of the trinket. With a 2% chance to proc & no ICD, you would not expect 1 proc every 50 casts. In fact, unless my probability calculation is way off, the chance of no proc in 50 casts would be 0.98^50 = 36.41%, going to 13.2% in 100 casts and 1.7% in 200 casts.

Hopefully I'm not too far off base but I would expect a realistic proc for the trinket is more likely once every 3-4 minutes. Obviously though, it has the possibility of going off multiple times in a fight.

At any rate, given spam casting with zero oFSR time where the value of Blue Dragon would be highest, the maximum benefit would be 2% of 100%/30% of Spirit. With 1000 Spirit, that equates to 66.67 which would put it quite firmly below other regen trinkets.

If you're getting the greatness card, I think the intellect version would probably be best overall. It seems silly to have an intellect proc but it really increases your regeneration significantly.

It probably will be, I can do some rough math later to check out a comparison.
However you will need to gear slightly more Spirit around it because otherwise you will not get a full mana pool return from Innervate (although not by any large amount) - and I usually like to have a buffer of around 3k~ from Innervate.

Atleast with my current gear, if i'd get an intellect card it would still proc spirit for me.

For trinkets i personally am actually at a loss for what would be worth using. I'm currently using the dragon figurine and the badge trinket, as i haven't got my hands on any other good trinkets yet. Going double regen trinkets feels like a bad idea for now though, as my mana really isn't pushed too hard on any current 25man encounters (did sapph-kt-malygos-sartharion today, and i didn't use a single mana pot, nor did i innervate myself). I'm thinking [Illustration of the Dragon Soul] would probably be the best one to get. Ideally, i guess having 2 spell power and 2 regeneration trinkets available would be the best, and switch between them based on need.

i'm thinking of using -

[Darkmoon Card: Greatness]
[Majestic Dragon Figurine]


the reason that i am thinking of using 2 regen trinkets, is the fact that you can gear and gem differently in other slots. ie more haste / crit on gear, and put more +19 SP gems in slots. i've noticed in raids that there has been lots of rings, necks, back pieces, and various other items with no spirit on them, but really good other stats on them. so 2 regen trinkets could make up for that.

Those are excellent trinkets, but Spell Power literally is our highest rated stat, so you should have probably been using Frost Wyrm and Firecracker Salmon anyways. Also, is there something about Furor that you know that I don't? :3

That's a negative on Furor. I level'd as Moonkin and obviously went brain dead when I did my resto spec!
(I made level 70 about 2 months before WoTLK was released. Played a Warlock for pre-BC/BC..)

Thank you for noticing. Sheesh! I'll have to move things around a bit now.

I agree to this. I currently am only using the Majestic Dragon and another random trink and still feel as though my regen is through the roof. With the 280 Spirit which you stack in the first minute of any given encounter plus innervate (even more with the glyph) I haven't seemed to have had any mana problems in 10-25 man Naxx and 10-25 Sarth. I haven't tried in the Malygos encounter yet though.

I have debated moving back towards more spell power/haste and less spirit. What are the thoughts on using any of the haste trinkets to reduce GCD possibly to remove the GCD talent from a given build?