From my old gaming rig. Q9450, P5K-e, and 4GB of Corsair Dominator DDR2 1066. You can have the sound card too if you want it. $100 for everything. Generally the ram alone goes for that much.
fullres: http://imgur.com/hIkBnnC
GTX 295, good card for the above and it can still run a lot of modern games. $50
fullres: http://imgur.com/x2EVVi3