I have a Dell Optiplex GX620 for sale. Specs: Intel p4 HT 3.0 ghz 4gb of memory 320gb hard drive two DVD burners extra USB 2.0 card with 4 ports (12 total) upgraded power supply (400+ watts, can't remember, can't read label) It has Windows XP on it, but that's what it came with. I ran Windows 7 on it. It has one spare hard drive tray in it. I ran 3 or 4 in there. Asking $100.