as a 55 healing op
this is what i'm currently running at
500 or so crit (30%+ w buff)
500 or so alarcity (which shaves a good chunk off my cast times and adds to my energy regen) 10%+
250 surge or so (70% or so)
rest is power...
really i find that while power gets you nice heals getting the heals off faster is better
(that and everything and its dog proc'ing tac adv...)