I am very odd in this but I love my favorite pve team to date is: Prot pally, Arcane Mage, Ele Sham, Survival Hunter, Disc Priest

I know alot of people hate disc priests but attonement spec heals

/castsequence reset=10 Holy Fire, Smite, Smite, Smite, Smite, Smite, Smite, Smite
/cast Power Infusion

+ my cover tank macro

/castsequence [@focus] Power Word: Shield, Prayer of Mending, Renew, Flash Heal, Flash Heal

In HoT's (hour of twilight heroics) I can clear all the bosses and trash and laugh as I watch things die super fast.

I also run this composition in LFR's. Ultraxion can suck if you don't have his button in the same place on every window.