CP-135-IN Intel Core 2 DUO E6300 "LGA775 Allendale" 1.86GHz (1066FSB) - OEM (CP-135-IN)
£107.99 £107.99
HS-017-AR Arctic Cooling Freezer 7 Pro CPU Cooler (Socket 775) (HS-017-AR)
£17.99 £17.99
GX-057-HT HIS ATI Radeon X1900 GT ICEQ 3 SILENT Heatpipe 256MB GDDR3 AVIVO TV-Out/Dual DVI (PCI-Express) - Retail (GX-057-HT)
£127.99 £127.99
CA-021-AK Akasa AK-ZEN-01-WH Zen White Case - No PSU (CA-021-AK)
£27.95 £27.95
CA-025-EN Enermax Liberty 500W ELT500AWT ATX2.2 Modular SLI Compliant PSU (CA-025-EN)
£61.99 £61.99
MB-003-AK Asrock ConroeXFire-eSATA2 (Socket 775) PCI-Express DDR2 Motherboard (MB-003-AK)
£53.99 £53.99
HD-085-SE Seagate Barracuda 7200.10 200GB ST3200820AS SATA-II 8MB Cache - OEM (HD-085-SE)
£45.95 £45.95
MY-059-CS Corsair 1GB DDR2 XMS2-5400C4 TwinX (2x512MB) (MY-059-CS)
£64.99 £64.99
Subtotal £508.84
Shipping (City Link Parcel Next Day (Delivered Mon-Fri)) £10.95
VAT £90.97
Total £610.76
Ok a bit over and no monitor, just specced the best i could using Core2Duo as the base.
You could go with a lower card, save some there.
Bear in mind, 2 or 3 of the items above are on this week only, which changes on Thursdays iirc.