What are the specs of your current system? It might be worthwhile to upgrade it slightly, with a better video card for instance. Unless you’re just dying to play some new game, I would wait until Bulldozer is released (wikipedia says second half of 2011) and see where the processor market goes then. By that time, the videocards and processors that are new and expensive today (AMD 69xx series, Geforce GTX 5xx series, 2nd gen i5/i7 processors, etc.) will drop in price. Then again, its arguably pointless to wait for the “newer, better tech” since today’s new tech is tomorrow’s obsolete tech, but I digress.
In short: I’d wait a few months. Earn some more money, wait for new AMD processors to come out and for prices to drop. In the meanwhile maybe upgrade the videocard in your current PC.