I have an HP XW6600 workstation that's new and pretty much not been used. Won it in a competition with HP some time ago, and don't really want to give it away, but have no idea what it's worth. There are some similar machines which sold on ebay, but only in the US so not sure how representative it is.
Spec is:
XW6600 (Intel 5400B chipset with 6321ESB southbridge)
1x Xeon E5430 2.66GHz QC CPU (mobo takes two)
2x 1GB = 2GB DDR2 RAM
250GB Seagate Barracuda HDD
DVD-RW with lightscribe
Southbridge gives you:
6x SATA AHCI / RAID ports
Onboard sound
Gig-E
7x USB ports, etc.
3x FireWire ports by means of a PCI card (2 on backplate, one on front fascia)
Comes with Vista Business 32bit. It's the OEM install from HP (MS product sticker on the panel) preloaded.
Being a professional workstation, case is really tidy, quiet, has LOTS of fans, 650W PSU, etc.
I can post photos if required.
Thanks
Xav