Price check on old rig

I am looking at getting rid of my computer and using the money to put towards a new system. I will most likely sell this to my father so I was hoping to get an honest and fair price assesment.

If there is additional info that is neccisary I can provide it.

Mobo: ASUS M2N-SLI Deluxe
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 6400+ (2 CPUs), ~3.2GHz
Memory: 4094MB RAM
Card name: NVIDIA GeForce 8600 GTS
Manufacturer: NVIDIA
Chip type: GeForce 8600 GTS
DAC type: Integrated RAMDAC
Display Memory: 2030 MB
Dedicated Memory: 239 MB
Shared Memory: 1791 MB
PSU: hx520w corsair

I purchased all of this from newegg and none of it is available to buy on their site anymore, so I am unsure what to price it all at.
Please help.