I'm currently leveling my 4th 5 box team (4 mages, 62, to catch up to my original vanilla mage, 80) and like you said, 0-60 a breeze (SFK, Cath, ZF, then BRD and Scholo). What I'm doing is questing until I get the dungeon quests, and doing the dungeons till I get sick of them. Did Ramps and BF all weekend, now I'm doing the quests to get UB quests unlocked. Prolly do that to 65, then go get rested up and go to UK. I'm not sure how my frost mage will do in UK yet, I did die a couple times in BF pulling too many packs (some of them do that knock back that really screws you up). For 70-80, I'll probably do all the major quest lines that I likes, and WG and Argent tournament as it's available.

Now that I know Dec 7 is the "due date", I can let them get some rested XP and still make my goal. That, and get them all transmute mastered like my other teams.