If your don't want to go warrior for the tank, there is always Earth Elementalists. Lots of armor skills will help with the tanking

. But I suggest going warrior for taking all the damage, along with a protection/healing monk.
Your friend can also go as necromancer, as they can work well as a secondary healer (either N/Mo or N/Rt) due to Soul Reaping. And the "I'll help if you die" part, isn't something a monk does, its what necromancers do when raising minions.
