The following is the current spec I've looked up on overclockers and decided to look at (Not ordered yet). It'll be my first time building a PC, so some of the parts may be unnecessary for building a PC so I'm asking whether or not I should change any of the parts to cheaper ones and such, like if the graphics card has a negligable performance difference from another cheaper card (suspected the Radeon HD 4870 X2 might be worth the money over the GTX 260..) or if the PSU is too much for the current build etc. I mean, if there's any blindingly obvious upgrade that would make a large performance difference for around ~£50 more it would be nice to know as well. Not to fussy about the case either, but a friend of mine told be that I would need a case of around this size to fit all the parts. Another thing I've considered is also not buying Vista, and using the Windows 7 Release Candidate on the computer. This would be the first time building a PC from scratch (done a lot of upgrades before) so any advice on that would be helpful as well. 
On it's uses, I'd like it for gaming on higher end games such as Empire: Total War and Crysis, from the benchmarks I've looked at the current build should be able to do fine running both those games.
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On it's uses, I'd like it for gaming on higher end games such as Empire: Total War and Crysis, from the benchmarks I've looked at the current build should be able to do fine running both those games.

Processor - Overclockers
Intel Core 2 Quad Q6700 LGA775 "Kentsfield" 2.66GHz (1066FSB) - OEM + FarCry 2 Bundle
£139.99
Hard Drive - Overclockers
Samsung SpinPoint F1 320GB SATA-II 16MB Cache - OEM (HD322HJ)
£40.24
Graphics Card - Overclockers
OcUK Value GeForce GTX 260 "Core 216 55nm" 896MB GDDR3 Dual DVI (PCI-Express) + Mirror's Edge
£139.99
Memory (RAM) - Overclockers
Corsair XMS2 DHX 4GB (2x2GB) DDR2 PC2-6400C5 TwinX Dual Channel (TWIN2X4096-6400C5DHX)
£39.99
Disc Drive - Overclockers
Samsung SH-S223F/BEBE 22x DVD±RW SATA Dual Layer ReWriter (Black) - OEM
£17.99
Case - Overclockers
Antec 300 Three Hundred Ultimate Gaming Case - Black (No PSU)
£49.99
Operating System - Overclockers
Microsoft Windows Vista Home Premium SP1 64-Bit - OEM (66I-01939)
£89.99
Power Supply - Overclockers
OCZ StealthXStream 600w Silent SLI Ready ATX2 Power Supply
£62.99
Motherboard - Overclockers
Gigabyte GA-EP45-UD3LR Intel P45 (Socket 775) PCI-Express DDR2 Motherboard
£105.79
Subtotal: £689.21
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