How much is my pc worth?

I'm building a new gaming pc but want to sell the one I have first. Not sure this is the right thread to ask in, if not please let me know. Anyways, here are the specs.

Case: XCLIO Windtunnel
CPU: Q9550 EO (Easily overclocked to 4ghz and ran through prime)
CPU Cooler: Tuniq Tower 120
Motherboard: EVGA 790i Ultra SLI
PSU: OCZ StealxStream 700w
Video Card: GTX 260 Core 216
Memory: OCZ Reaper 4gb DDR3
Hard Drive: Western Digital Blue 640gb.
DVD: Samsung DVD Burner


Everything has worked flawlessly and have not had any problems whatsoever. How much do you guys think I can sell this for. I plan on placing a craigslist ad tomorrow.