Second-hand PC value?

[pincher]

Got my desktop up and running again so want to sell it as I have bought a replacement.

Spec as follows;

Compaq 6520 Presario
Intel Pentium 4 2.4GHz Processor
768Mb DDR RAM
160Gb Hard Drive (Brand new - installed yesterday)
Separate CD ROM & DVD RW
128Mb NVidia GeForce MX440 Graphics Card
6x USB Connections
1x Firewire Connection
Windows XP Pro SP2
Office 2007
15" Compaq TFT Monitor

Anyone got a rough idea on value?

[pincher]

Cheers chaps - might put it on Ebay with a reserve closer to £200 and if it doesn't sell, give it to my 6 year-old.

That way, she'll keep her grubby mitts of my shiny new iMac