longgaledang :
i think this will be good
http://pcpartpicker.com/p/3rCuY
He said he wants to BUY one, not build it. While he can certainly save some money building on his own, its not for everyone.
OP, you should be able to get a decent gaming rig in your price range. I'm assuming US dollars. I normally build my own, but have purchased from Cyberpower before. No complaints. In fact, my current rig that I'm about to replace was purchsed there. I've upgraded my RAM and vid card, but its lasted me 5 years.