For PVE I'll always be a fan of mixed teams coupled with smart castsequences and a dedicated AOE capable healer. I like having arcane intellect, totems, paladin blessings, fortitude, divine spirit, fear ward, replenishment, heroism, mark of the wild, moonkin aura and whatever else up all at once. It's a huge difference in power. The only reason any team can be super-successful these days is because the heroics were poorly balanced for the last couple of major patches and you outgear them with just one piece of badge gear.