What's a good combo with Warrior for dual boxing?

[Matty]

In pvp I think Priest would be better. You loose WF but you got a dispel magic and 2 instant heals. Your warrior will run and your shaman will have trouble to heal.
In pve I think shaman is better.

Druid would be good too, heals, thorns motw, faerie fire for armor reduction, magic damage against high armor mobs, etc. but any healer would be great honestly. Apparently paladins are really good with warriors but that requires being alliance