Which WoW priest specialization should I take? I'm a level 10 dranai priest that plans to kinda do nothing but solo quest & run 5 man instances through the dungeon finder. I know i an always change it & get a dual spec later but i was wondering what would be best to go with for lower level questing & duegeon running.

PS: I'm new(ish) to wow, have no expansions for wow & am still thinking about if i want to buy them or not (i'll figure it out when i have 1-2 char's at lv 70)

Disc/holy is for healing as you already probably know. Shadow will always dominate while questing, but you will have about 15+ minute queues for dungeons. You can, however, level as holy or disc. I prefer disc. All you do is holy fire and smite things to death, while shielding yourself. Pick up mining/herbalism or mining/skinng or herbalism/skinning and put all the stuff you get from it on the auction house for gold.