Selling Old Computer how much can i get?

Ok im selling my older computer i just upgraded to a q6600, 2 gb ddr2 800, 8800 gts 640. Here is my old computer
CPU: Intel P4 3.2 GHZ ( overclocked to 3.5GHZ )
Motherboard: ASUS P4C800-E Deluxe
RAM: 2 GB DDR 400 Corsair Platinum Series
Video Card: NVIDIA Geforce BFG 6800 GT OC AGP
Hard Drives: 2x 36gb Western Digital Raptors 10,000 RPM in RAID 0 (70Gb)
Optical Drives: Sony 21x DVD drive
Power Supply: Antec True power 450w
Case: CoolerMaster Praetorian Mid-tower
CPU Heatsink: Zalman CNPS 9500
SoundCard: Soundblaster Audigy 4
Floppy Drive: 3.5" floppy

Im selling it on ebay and want to know what u guys think i could get for it, also should i use the money to upgrade to a 8900/9800 series card when they come out or just upgrade to the GTX using the EVGA stepup plan?