What price should i ask for my old PC?[Help]

[VGX]

-Pentium 4 3ghz duel core Performace rated at 4.49ghz (per sys req labs)
-Soyo Dragon 2 P4I865PE mobo 800mhz FSB (springdale chipset)
-WD 120 GB HDD (8mb cache)
-Seagate 200 GB HDD (8mb cache)
-EVGA GeForce 7800GS 256MB 8xAGP DDR3
-2.5 GB Kingston PC3200 RAM
-DVD Burner , CD Burner
-Creative Sound Blaster sound card
-450 watt PSU
-Cool green case with lights and shit


Ive already started purchasing parts for my new sli rig

 

[Hugo]

2 BILLION YUAN

 

[Amadeus]

about $6-700.