I've stayed away from fire as I just can't imagine managing the micro procs necessary to maximize that spec. I'm giving up the perfect arcane rotation of only casting AM on a missle barrage proc, but its a total "no maintenance" spam that seems pretty darn good.

When the changes to arcane go live that I'd read about (AB stacking, what 4 or 5 times now?), I'll probably drop ABarr altogether as the odds are I'll have a missle barrage proc up every time after that many casts of AB.

In five mans mana has NEVER been an issue and its simple enough to have a "no channeling" condition in my DPS macro so I can pop Evocation or a Mana Gem.