I've gone with quad-core and it is still well under the budget so you could upgrade anything you wanted pretty much or if you want to aim it more at gaming then drop back down to dual core and get a better graphics card. Point to note though, the Ram is only on offer for this weekend.
NEC AD7170S Serial ATA 18x18 DVD±RW Dual Layer ReWriter (Black) - OEM £15.99
(£18.79) £15.99
(£18.79)
Abit IP35-E (Socket 775) PCI-Express DDR2 Motherboard £64.99
(£76.36) £64.99
(£76.36)
Antec NSK 6580 Super Midi Tower Case - 430W Earth Watts PSU £57.99
(£68.14) £57.99
(£68.14)
GeIL 2GB (2x1GB) PC6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC) £33.99
(£39.94) £33.99
(£39.94)
Intel Core 2 Quad Pro Q6600 "Energy Efficient 95W Edition" 2.40GHz (1066FSB) - Retail £154.99
(£182.11) £154.99
(£182.11)
Hitachi Deskstar T7K500 250GB SATA-II 8MB Cache - OEM (0A33423) £34.99
(£41.11) £34.99
(£41.11)
Samsung SM-920NW 19" Widescreen LCD Monitor - Silver/Black £104.99
(£123.36) £104.99
(£123.36)
Microsoft Black Value Pack 2.0 - OEM (S82-00029) £12.99
(£15.26) £12.99
(£15.26)
Microsoft Windows Vista Home Premium 64-Bit Edition DVD - OEM - 1Pk (66I-00788) £59.99
(£70.49) £59.99
(£70.49)
OcUK ATI Radeon X1950 Pro 512MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail £65.99
(£77.54) £65.99
(£77.54)
Sub Total : £606.90
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £14.95
VAT is being charged at 17.5% VAT : £108.82
Total : £730.67