Looking to sell my computer, would like some advice

I'd like to sell my desktop, however I have never sold any computers before so I'm not sure what price I should append to it. I'd like your opinion.

Case: Antec Three Hundred
Motherboard: ASRock B75M LGA
CPU: Intel Core i3-2120
Video card: Sapphire HD 6850 1GB
RAM: Patriot Gamer 2 series 2x4GB sticks DDR3 1333
Optical Drive: Samsung 22X DVD Burner SATA Model SH-222BB/BEBE
PSU: OCZ StealthXStream OCZ500SXS 500W
Monitor: Acer AL2223W
Keyboard: Micro Innovations KB565BL
Mouse: I honesty can't remember. Nothing too glorious, some Logitech mouse from years ago, the labels are too scratched to read. It's not pretty but it still works perfectly.
Hard drive: Western Digital Blue 640 GB 7200 RPM 16 MB cache
Western Digital Blue 160 GB 7200 RPM 8 MB cache
No operating system