Intel Core 2 Quad Q6600 Energy Efficient 95W edition Socket 775 (2.40GHz) G0 Stepping L2 8MB Cache OEM Processor £129.99 Great Choice
OCZ 4GB (2 x 2GB) PC2-6400C5 Dual Channel Vista Gold Series DDR2 £69.99not the fastest for price but should be ok... id go for Crucial Ballistix 2GB (2x1GB) DDR2 PC2-6400C4 800MHz Dual Channel Kit (BL2KIT12864AA804)
Gigabyte GeForce 8800 GT 512MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail £149.99 should be fine, good choice
Gigabyte GA-P35C-DS3R Socket 775 8 Channel Audio ATX Motherboard £62.62 should be fine
HP DVD1040 20x DVD±RW RAM Lightscribe Black - OEM £15.31 cant really go wrong here
Microsoft Windows Vista Home Premium x32Bit OEM 1PK DVD £52.76 was gonna say cant go wrong.. but lets say.. its got DX10
Logitech Cordless Desktop EX 110 - USB/PS2 £14.40 should be ok .. the keyboard that is.. not sure on the mouse
Plexus Kettle Type Power Lead 2m £1.41 :freak: are you planning on making cups of tea while gaming? wtf m8 you dont need this lol
Extra Value 12" Red Dual Cold Cathode Kit £2.54 pretty lights, red good colour dont glare so much in the dark
Western Digital WD3200AAKS 320GB SATAII 16MB Cache 7200 RPM - OEM £39.14 cant go to wrong here... is 320gb enough
Arctic Cooling AC-FRZ-7P Freezer 7 Pro Socket 775 Processor Cooler £9.64 Wheres you get an Artic Freezer 7 Pro for £9.63? good choice
Plexus Gold Plated HDMI To DVI-D Dual Link Cable (Black) 2m £3.39 whats this for .. ps3?
Casecom Black Mid Tower Case - Front Blue LED 120mm Fan - With Side Window £8.50 - what sort of case costs £8.50
Arctic Power 500W PSU With PCI-E SATA, 20+4 ATX12V 8pin +12V Connectors - Retail Boxed Artic who? just choice one thats been recommended .. all was better then your choice.. dont skimp!
theres ma 2pence.. hope it helps.