I'd say any class will do. You can also get Healing Breeze as a monk secondary now, which can be a decent heal in Pre. I'd be tempted to go for Ele/Monk.
Ele monk is the best healer, ele mesmer the best attacker. Of the two, the healing you gain outweighs the damage though. You can still do just fine as other things though of course.
I use a Ran/W Bow + axe + pet
works well get aggro with pet and pew pew them with a bow if they break aggro toos up troll ungent and weapon swap to axe +al vs Char on shield (or +al vs Fire) and +dmg Vs Char on axe works well for me...