Maximum PC

Looking to sell my custom-built gaming computer...

Here's the specs:
* Intel Core 2 Duo E8400 processor
* 2 GB of RAM
* Gigabyte EP43 (P43) motherboard
* Creative Labs SoundBlaster SE PCI card
* 500 GB Western Digital Black drive (32MB cache, SATA 3.0Gbps, 7200 RPM)
* Asus ATI Radeon HD4870 1GB PCI Express video card
* 500-watt Antec power supply (EarthWatts)
* Antec P180 black case (a bit aged, and some scratches, but still in fairly good condition--it's about 5 years old).
* NO OPERATING SYSTEM OR SOFTWARE - Just the parts as listed above (assembled into a working computer)

Suggestions for estimated resale value? $350-400?