Would it be worth it to spec the paladin to Sanctity Aura and let the priests be Disc/Holy DPS'ers?

I was thinking about doing something similar, because I'm really trying to think of a good Tank/DPS team consisting of 2 classes that doesn't include shamans. If the priests aren't confined to shadow form, they can sorta be versitle like a shaman, healing and dpsing without needing to change a bunch of stuff around (equipment, stances, etc.).