I'd go Shadow, and queue as a healer, you can totally go shadow in healer gear, due to the spirit being converted to hit. Questing is terribly slow in Discipline, I remember I tried to do dailies in Discipline in Cata and it SUCKED...
Btw, is Kargath a low pop realm, if so I'd love to group with you through Real ID/Battletag, because I'm on Illidan, and I know I'll mostly quest, so I need to be able to be transferred to a different realm through Battletag/Real ID.
My Battletag is in my signature =D
Click my signature for my Armory!Twitter: @DarkAscension
Battle Tag: Phagemark0v#1416