Quote Originally Posted by accretion
I currently 2-box a BM Hunter and Disc Priest and it's a terrific all-around combination. With a high-aggro pet (e.g. bird with screech) you can even duo most instances. I've grouped the hunter with many other combinations including mage, druid, hunter and warlock and the priest is by far the best complement when it comes to leveling and completing challenging quests.
Sounds rather awesome now that I think about it - as long as one doesn't streal aggro from the pet, the only problem left is keeping it alive, and what better way to do that than a dedicated healer? I gotta log on and see what I can do with my lv18 hunters and lv42 priests now.