Check my armory in signature (Zuldrak), although I am frost specced atm, my gear and enchants are fire (almost 1100 fire damage unbuffed - speccing fire I get some additional fire damage points). I can guarantee you that fire in long fights this is the best DPS and Mid-DPM in the game, I only was below some warlock sometimes.

The best DPM, but lowest DPS (top in some fights) is frost.
And the top DPS and lowest DPM is arcane.

Anyway you need 202 hit rating or 164 + Elemental Precision Talent, if you want to hit almost all spells and explore your potential.