How much can I ask?

Hi guys,

I'm thinking of selling my pc to get a laptop for school etc. but I'm not sure how much I can ask for it.

It comes with a 22 inch screen, audio and mouse/keyboard wireless.

Specs:

Besturingssysteem: Windows Vista Home Premium Service Pack 2 32-bits
Processor: Intel Core 2CPU 6600 @ 2.40 GHz 2.40 GHz
RAMGeheugen: 3 GB RAM
Videokaart: NVIDIA GeForce 8800 GTS
Harde Schijf: 372 GB

Let me know! :)