My suspicion is probably Fury of the Five Flights. 320 static AP is hard to turn down.
i would say for trash mirror or loathebs..for bosses fury just because on trash its usually dead by the time you get the full ap from it
hmm it seems like mirror > fotff based on some calculations
what calculations though...according to maxdps.com and the dps spreadsheet on elitistjerks the 320 ap is far more valuable than 84 crit rating
uh... 1000ap proc?