If your goal is to feed preraid BiS to the hunter to get it geared quickly for MC then warrior, priest, mage, warlock, hunter should a solid PvE group.

Good mix of buffs and utility and no competition for agility gear or ranged weapons.

It's not really that much more difficult running mixed PvE in classic since all DPS rotations are 1-2 buttons. Mages spam frostbolt, warlocks spam shadow bolt. Hunter is actually the most difficult since you have to figure out a macro doesn't clip your autos.