Don't know much about Novak stuff, but I think that ezRun would get pretty hot in the Firestorm. If it was the 60A version it'd be better suited.
If I were you, i'd look out for a roller and fit your own electrics.
Done a lot of research on a suitable esc combo for the Firestorm and have found that the best for the buck is the new Castle Sidewinder sct with a neu motor. They can be obtained new for around £60 on eBay, and are MUCH better systems than the ezRun.
I've just bought a new E Firestorm 10t for less than £100, and have just ordered this combo myself.
