warlock and disc priest
warrior and disc priest

the reason i recommend pairing with a priest is u can make a castrandom macro of pain suppression, power word shield, prayer of mending and flash heal, psychic scream and he will survive for quite a while if they focus ur priest, otherwise you can have the priest heal ur main. disc priest is the most survivable healer with the least amt of attention required.

another adv of warlock and disc priest is you can do warlock/shadow until u get good gear and just dot people up and run around and los people.

but all in all its hard to do decent in 2v2 since you don't get any adv of assist training people and you get all the disadvantage of mboxing.