I have 5x Disc Priests.
Got them to 60th during RAF, and level them high enough for tradeskills; have never pvp'd with them... thought they might be a change of pace, to heal/support friendlies from way in the back, during AV's.

My current team.. 5x Feral.
Each have a Resto off-spec.
Much better chance to pvp with these, as they're max level and will be leveled first in Cata.