Mage question: ffb vs arcane

[yakitorii]

Hi all - so I levelled my mage to 80 with frost, and enjoyed the survability, but once I hit 80 and got ready to raid, I read up a lot and decided to switch to a fire-based ffb. i've been going along, running heroics and Naxx a few times, and looked at the new theorycraft-o-matic site to update my gear comparison numbers.

I checked out theoretical DPS for my current spec vs for arcane, and it looked like the arcane spec would do about 500DPS more with the exact same gear.

What do y'all think? I suppose I could just respec and try it myself, but I wondered what other lurker mages thought.

Here are the links:
My character at the armory

Theory-craft-o-matic

Arcane spec that TCOM likes

Thanks, y'all!