PVE Holy healer here.
T1: Void tendril looks incredibly nice/OP, but I would probably still go for the fearbomb. Its an old companionship that I would like to continue, me and Psychic Scream.
T2: Body and Soul is half the reason I am a holypriest. No competition. But now that I can get this as disc as well... ouch.
T3: AA would need to be tweaked to be useful for non-disc? Or am I missing something here? Either way, Surge of Light sucks bigtime right now, so Divine Star it is.
T4: I like having Desperate prayer. So DP it is.
T5: Test of Faith, Power Infusion or Serendipity? Though choice. But PI is the superior choice. Serendipity costs too much mana, and ToF is not really on par.
T6: Void shift is effectively a 3 min CD Lay on Hands, if you have full HP. How awesome isn't that? But Vampiric Dominance may just be too good to pass up.