http://techreport.com/articles.x/21876/4 $900. They give options on the next page.
My understanding is that most games can only use a few threads, so there's likely no benefit in going above 4 cores for a while, and a fast hyperthreaded 2-core chip might be even better.
Intel's probably the better way to go, but a Phenom might be close enough and cheaper.
HTH a bit. Good luck!
Cheers,
Scott.
(Who also isn't a gamer, but who may be getting into video editing as a hobby soon.)