The other alternative is A recruit C, create new chars on both, level to 14, then switch to using mage on A and new char on C and quest to 60. You get triple XP for quests as well.

It's all down to how you like to play, me, I can't stand instance grinding.

You could also, if money isn't a problem, recruit D, E, and F so that you end up with a five boxing setup - it takes no longer to level five than it does two or three. This way, when you decide to five box later oen, you'll have the full setup without having to do it all again.