The Akasa Mirage is just there as a placeweight since OcUK don't have the Eclipse in stock currently. The rest is a mix of near top end parts and still doesn't threaten your budget, you could add a sound card and/or extra hard drives if you feel like it comfortably. The other thing is that if you go with this or similar you are getting a Conroe based system which basically begs to be overclocked, the 6700 as the next CPU in the range would also fit into the budget but you are spending over £100 extra for very little in the way of real gains especially as with a bit of mild overclocking you could get the same benefit.
CA-017-AK Akasa Mirage 62 Aluminium Case - No PSU (CA-017-AK)
£83.95 £83.95
CA-004-CS Corsair HX 620W ATX2.2 Modular SLI Compliant PSU (CMPSU-620HXUK) (CA-004-CS)
£99.99 £99.99
MB-152-AS Asus P5W DH Deluxe WiFi (Socket 775) PCI-Express DDR2 Motherboard (MB-152-AS)
£129.99 £129.99
MY-058-GL GeIL 2GB (2x1GB) PC6400 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC) (MY-058-GL)
£169.99 £169.99
CD-041-NE NEC AD5170 18x18 DVD±RW Dual Layer ReWriter (Black) - OEM (CD-041-NE)
£18.95 £18.95
HD-078-SE Seagate Barracuda 7200.10 320GB ST3320620AS SATA-II 16MB Cache - OEM (HD-078-SE)
£62.95 £62.95
GX-050-CO Connect3D ATI Radeon X1950 XT-X SILENT Heatpipe 512MB GDDR4 AVIVO TV-Out/Dual DVI (PCI-Express) - Retail (GX-050-CO)
£244.99 £244.99
CP-128-IN Intel Core 2 DUO E6600 "LGA775 Conroe" 2.40GHz (1066FSB) - Retail (CP-128-IN)
£194.99 £194.99
Subtotal £1,005.80
Shipping (City Link Parcel Next Day (Delivered Mon-Fri)) £12.95
VAT £178.29
Total £1,197.04