Sorry, should have been more specific...
It's running a Core2 E2160 CPU, 4Gigs of DDR2 RAM (OCZ 4GB 2x2Gb PC2-6400), 8400GS Video Card.
Will be running 1x320Gb SATA Boot drive and 4x 750Gb Spinpoint SATA drives (in RAID 5 which I'd like done on the board itself without forking out for a hardware card).
Needs to be standard ATX or smaller footprint.
Price ideally under £80 excluding VAT