Spend 3/4 of that price and get a good laptop instead. If you are not in a rush, just check deal sites daily for a great deals.
I just got a quad core Samsung laptop with 4gb ram and 750gb hd for $350 at staples. Added another 4gb ram to it for $20 and OC’d it from 1.6 to 2.2 stable. Plays Borderlands in medium setting with 35~40fps avg.