Im looking to either get one off ebay or build something.

Ideally has to have 2gb-4gb ram as I want to run multiple OS/servers via either vmware or Microsoft Virtual PC

Ive thought about building one & this is what I have found.

P4 630 3.0GHz Retail - £132
Abit AW8-MAX £159
GeIL 2GB (2x1GB) PC5300 667MHz Value DDR2 Dual Channel Kit £177
HIS Excalibur ATI Radeon X300SE 128MB DDR TV-Out/DVI Retail £36
Samsung SpinPoint P SP2504C 250GB SATA-II 8MB Cache - OEM - £86

Total £590 - I know it can be had cheaper, but would it be upto the task?