How much would you think my computer worth?

Hi all.

I a looking at selling two of my old pc's as I have built my own over the last year, but im not sure how much they are worth.

PC1.
Model: Advent 3511
CPU: Intel Pentium 4 2.80GHz
Memory: 512MB DDR PC2100 RAM (2 memory slots. Max 2GB) X2
Hard Drive: 120GB. Either a Maxtor DiamondMax Plus 9 6Y120LO or a Samsung SV1204H (this will be removed before fitting so no OS)
CD Drive: 40x 24x 12x Mitsumi 48X9TE CDRW / 16x Samsung SD-616F DVD-ROM
Floppy Drive: Floppy disk drive fitted
Video Card: nVIDIA Geforce 4 MX440 128MB
Sound Card: Avance AC'97 SoundMax
Modem: Conexant 56K PCI WinModem
Network Card: RealTek 8100L (onboard - RTL8139)
Ports: (front) 2x USB
Case: Fiat 2

PC2.
Model: HP Pavilion a6150.uk
CPU: Intel Core2 Quad Q6600
Memory: 2048MB DDR2-SDRAM
Hard Drive: 80GB Pocket Media Drive. 320GB HDD (this will be removed before fitting so no OS)
CD Drive: Phillips Lightscribe DVD RW
Video: nNVIDIA GeForce 8400 GS TurboCache with PureVideo technology. HDMI port. TV-Out, DVI port
Sound: Intel High Definition Audio 7.1


Any help much appreciated.

Thanks

Carl

with out the os for the first about £50 best to look on ebay.....

may be £100 for pc2 best too look an ebay....

you could try to fit linux too pc2....... if they want its free.... and get the job done