Not wanting to do a direct hijack here, but I finally got my mage team to 80 about 8 days ago and I'm still trying to figure out the best way to move forward with them as well. I would love to give you an armory link, but I can't seem to find any of my toons or guilds on the Armory today

I find myself using nearly nothing but instants against other players, and cast times for Bal/Vann/tanks only. So I'm speced deep arcane currently, with splashes of Frost and Fire for cooldown reductions
http://www.wowhead.com/?talent#ocxifzMcdcGuGtedfZ0h

I've started gearing with nothing but required hit and Crit, which has me looking at a new spec -- http://www.wowhead.com/?talent#of0ifzMcdeGzMt0dfVZbI0b
My goal is to maximize the damage of every crit (with Fire and Frost also enjoying Spell Power from Arcane) and use Frostfire Bolt for PoM and for stationary burndowns. I'd love some comments.

Also, I'm still searching for a good Slow and Poly macro. I wrote one, but I'm starting to think that the evaluation logic works from right to left, and not left to right. When I try to use these in arena, I end up just focusing on my then-leader's target.

Code:
#showtooltip Slow
/cast [@arena1,exists,nodead] Slow, [@focustarget,harm] Slow, [@focustargettarget,harm] Slow, [@focustargettargettarget,harm] Slow
 
#showtooltip Polymorph
/cast [@arena1,exists,nodead] Polymorph, [@focustarget,harm] Polymorph, [@focustargettarget,harm] Polymorph, [@focustargettargettarget,harm] Polymorph