Warrior, cleric, mage, beastlord, zerker, monk.
Monk pulls, adds a very solid amount of dps.
Warrior tanks.
Cleric heals, buffs, and has good auras for tank
Beastlord adds buffs for the melee classes and pets, also slows.
Mage adds good caster dps and also summons pet gear.
Zerker laughs at mobs.