Hacp: sorry, mind was elsewhere with the ram, but my point still stands. Go to the DFI forums and research your ram thoroughly. It is absolutely key to a decent overclock with the DFI boards (which is the first thing the DFI techs will tell you).
As for the PSU, you don't need HUGE wattage/amps if you are not going SLI, but please please trust me when I say to have at least 480 watts on 24 pins from a quality manufacturer. You most likely will live to regret it otherwise. My previous suggestions are as low budget as you should go. Go to the DFI site, there is a great list by David Hammock with recommended PSUs.