Tank: Knight+++, Duskblade++, Dragon Shaman+
Damage-dealing melee: Duskblade+++, Knight++
Utility caster: Beguiler+++, Duskblade+
Artillery: Dragon Shaman++, Duskblade+
Healer: Dragon Shaman++
Sneaky/Skills: Beguiler+++
Healing is the weak point. Use the Reserve Point option from Unearthed...