Originally Posted by
harky
If you're in T9+ gear you can heal not only in Shadow gear, but as Shadow. Switch for the ICC instances, but anything else? Meh. A PW:S from a Shadow Priest is usually enough to keep a tank alive through trash and bosses typically do less damage than trash pulls. If things go wrong spam Flash Heal.
Err.. and neither Holy, nor Disc requires much spirit at all to do well. Int is our primary regen stat, not spirit. Holy liked spirit pre-4.0 because it gave regen and SP. Now it no longer gives SP, but now Int does. Which is great, because Int also gives more regen than spirit... and Crit isn't better than Haste as Disc. Especially if you have under 700 haste. At ~245 ilevel: Int > Haste (to ~700) > Mastery > Haste (to 1269) > Crit > Spirit. Only change at higher gear levels is that Mastery becomes better than Int.