Hmm. The priest fort buff would be lovely, but the spirit buff doesn't seem very useful to me. None of my casters would live outside of the 5sr where the spirit really helps (I haven't played since TBC, so if the regen model has changed please inform me). Yes the mage/boomkin have 30% regen, but once they get replinishment I doubt they will be running out of mana. I already have the spell power buff from the demo lock (iirc the imp spirit buff can become better depending on gear, but I can't look it up at work)

So the brings me down to the debate between Stam buff/AOE Shield vs Totems/Reincarnation.
I'll have to think on this one.