I just got my priest to Northrend, and my healing spec is holy, with enough points into Disc to get Meditation. I have been healing dungeons all the way up through the levels, and often have mana issues. I keep a ton of pots and use SF at every CD, but I still have to stop and drink all the time. If the tank is really geared for the dungeon it's usually fine, but if I have to heal him/her fairly consistently, added to the group damage that occurs, I'm practically oom after every couple pulls.
So my question is, would respeccing Disc alleviate my mana issues, or will I be fine as holy when I get some more blue dungeon gear?