I was affliction for the first 40 levels or so and then went destruction to level 69 or so. But find it hard to keep up mana/health bars against the Northrend mobs. Some of it can be chalked up to the fact that those mobs are harder than the Outland mobs, but some of it is because the mobs peel off and get on me. So I was thinking of going back to affliction but wanted to ask those professional warlocks out there if there was a more survivable leveling spec.