Mage + Priest
Spec: Mage - Frost (slows mobs while doing good dmg) | Priest - Disc (healing and decent dps)
Reason: Mages tend to die a lot, good to have someone that can heal with you and rez when you die.
Prof: Mining (gold maker), Enchanting (ring enchants + DE (more gold making)), JC (awesome trinkets and able to get dragon's eye from daily)