How much do you have to spend and what do you already have? If you've already got everything else, you could probably get a whole new case, PSU, mobo and cpu for under 200 bucks. Maybe 150 if you really watch it. I think that about 160ish could get you a case with power supply, cheap board and sempron dual core. The case comes with a psu, not high name brand or anything but the ratings look good and it's only 50 bucks for both. The psu if i'm not mistaken is a 585 watt with dual 12v+ rails one rated for 20 amps, the other at 19. Never used one before, but if you have a low budget I might give it a shot. Because amd sempron dual cores are only 50 and a motherboard, could probably be had cheap, depending on how much you want to spend. I might look into that if it were me.