I've left quite a bit of room in the budget in case you need speakers, soundcard, more hard drives or a better keyboard/mouse etc but this should do as a basic starting point.
XFX GeForce 8800 GTX Extreme 768MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail (PV-T80F-SHE9) £164.99
(£193.86) £164.99
(£193.86)
OcUK Value L2442WD-VA 24" Widescreen LCD Monitor - Glossy Black £219.99
(£258.49) £219.99
(£258.49)
Microsoft Windows Vista Home Premium 64-Bit Edition DVD - OEM - 1Pk (66I-01939) £59.99
(£70.49) £59.99
(£70.49)
Microsoft Black Value Pack 2.0 - OEM (S82-00029) £13.99
(£16.44) £13.99
(£16.44)
Corsair HX 620W ATX2.2 Modular SLI Compliant PSU (CMPSU-620HXUK) £74.99
(£88.11) £74.99
(£88.11)
Antec P182 Super Midi Tower Case - No PSU (Gun Metal Black) £78.99
(£92.81) £78.99
(£92.81)
Asus P5E Intel X38 (Socket 775) PCI-Express DDR2 Motherboard £119.99
(£140.99) £119.99
(£140.99)
G.Skill 4GB DDR2 PQ PC2-6400C5 (2x2GB) CAS5 Dual Channel Kit (F2-6400CL5D-4GBPQ) £49.99
(£58.74) £49.99
(£58.74)
Intel Core 2 Quad Pro Q6600 "Energy Efficient SLACR 95W Edition" 2.40GHz (1066FSB) - Retail £116.99
(£137.46) £116.99
(£137.46)
Noctua NH-U12P CPU Cooler (Socket AM2/LGA775) £35.99
(£42.29) £35.99
(£42.29)
Samsung SH-S203D 20x DVD±RW SATA Dual Layer ReWriter (Black) - OEM £14.99
(£17.61) £14.99
(£17.61)
Seagate Barracuda 7200.11 500GB SATA-II 32MB Cache - OEM (ST3500320AS) £53.99
(£63.44) £53.99
(£63.44)
Sub Total : £1,004.88
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £25.53
VAT is being charged at 17.5% VAT : £180.32
Total : £1,210.74