Paladin
Cleric/Mage
Fighter/Thief
Ranger or Fighter(just have them use ranged weapons)
Mage
Fighter/Cleric
I'll leave kit selection up to you(if you feel like being a dirty cheater, use a save editor to give multi-classes kits, IMO they should have that ability). You want at least 2 sources each for arcane and divine casting, as well as a large amount of combat specialists. Paladins are a better tan than Barbarians IMO, because they have that extra saving throw bonus.
Edit: missed a few keystrokes, it's pretty late here.