If I had that ammount of money I would get this:
Asus A8R32-MVP Deluxe Crossfire (Socket 939) PCI-Express Motherboard (MB-131-AS) £109.95
AMD Athlon 64 X2 Dual Core 4400+ (Socket 939) - Retail (ADA4400CDBOX) (CP-127-AM) £279.95
Connect3D ATI Radeon X1900 XT-X 512MB GDDR3 AVIVO TV-Out/Dual DVI (PCI-Express) - Retail (3055) (GX-046-CO) £314.95
FSP Sparkle FX600-GLN Epsilon 600W ATX2.0 PSU (CA-002-SK) £69.95
Subtotal £774.80
VAT £135.59
Total £910.39