As the author of some of the theorycrafting work (search and you'll find it), I'll chime in here.
You can safely ignore all the discussions about higher sustained DPS, burst, or the ability for ToWs to "cut through" resilience. All good points of analysis, but the real problem is that you will be using Fire Nova totems in arena in almost every fight. Once that happens, you have to either waste a precious GCD to reapply ToWs, or you get NO benefit.
Hold out for WotLK, and you can get both. :)