Richard, what would you make of a system based around
Gigabyte GA-K8N Socket 754 Nvidia Nforce3 PRO Lan USB2 FSB800 ATA133 -> £56.12
Retail Boxed AMD Athlon 64 3000 Newcastle 512k Socket 754Pin CPU -> £113.65
Plus a gig of PC3200 RAM and a Radeon Pro 9800? It's not going to be the state of the art machine that the S939 would be, but it's a lot cheaper (as with Daysleeper's example, it's less than £500 all-in). Plus £300 for a 17" TFT and it's looking like more bang for the buck than the original system on offer...