I'd happily settle for a copy of Warhammer online's Warrior Priest, it was a pretty unique concept that offered moderate to decent DPS and mostly sufficient sustainable healing at the expense of durability and burst heals. I'm honestly surprised that it hasn't been copied more (Only SWTOR really tried with the Scoundrel/Operative).

For those that haven't played either, the easiest way to think of it would be somewhat like a Monk but instead of generating greased lightning stacks for additional DPS, you're gaining 'mp' for your healing. No DPS = very little healing.