Possibly, but the xtra $30 or so it likely better spent on the GPU and other parts.
When working on a tight budget, I would prefer to cut my spending where it could result in absolutely no loss in performance or quality. The only place that can be done is really in the CPU since either a 3600 or 4800 could result in the same performance, same heat dissipation, same power usage, etc.. etc.. etc.. The only difference is the price you pay.
Some of the posts have listed at 7600 video card.
Others have gone over budget.
My favorite build is from "DeCripple" who squeezed in a very nice Video Card for a total of $430. This would leave room for a CPU with a higher default clock if you so chose I presume.