I promised Ghost that I would do him a rough list of components to build a PC. I worked on a budget of around £500 for the main components, plus the additional cost of case and monitor if needed.
Here is the setup I've come up with:
Harddrive - Seagate Barracuda 7200.11 500GB SATA II 7200rpm 16Mb Cache 11ms 300Mb/s - £45.24
Motherboard - Asus P5N-E SLI 650I Motherboard DDR2 PCI-E Gigabit LAN - £62.35
Ram - DDR2 800 - Geil Black Dragon PC2-6400 800Mhz 4GB Kit (2x2GB) - £56.40
CPU - LGA775 package - Intel Quad Core Q6600 95Watt G0 Stepping (This is the one that Overclocks) 4 x 2.40Ghz 8Mb Cache 1066 FSB Quad Core Processor - £127.49
PSU - Hiper 580 Watt, ATX v2.2, Temp control Act. PFC, Sli Cert - £48.76
Graphics Card - XFX GeForce 9600GT XXX 512mb DDR3, 256-bit, GPU clock 700mhz, Dual-DVI, HDMI, HDTV, Company of heroes bundle - £130.43
Total price: £470.67 inc. VAT
Cases
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Thermaltake Tsunami Dream Black Aluminium Case No PSU - £62.56
Thermaltake Tsunami Dream Black Aluminium Case With Window No PSU - £70.90
Monitors
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SAMSUNG SM245B 24" 16:10 LCD TFT with 5ms Response time, DVI, 1000:1 Contrast Ratio. 1920 x 1200 - £289.05
Dell E248WFP TFT Monitor 24" 5ms 1000:1 Widescreen Silver/Black DVI - 3 Years Warranty - £297.27
All of these prices are quoted from a local store via their website. Doing a bit of shopping about should get some cheaper prices.
With this setup you would end up with a Quad Core Intel CPU, 4GB ram, 9600GT graphics card, and 500GB HD. More than enough for most gamers. This setup will run current games well in Vista.
The only component I've missed out is a DVD-RW. I recommend the Pioneer DVR-215DB 20x SATA for £19.39, or a similar NEC one. Make sure you get an SATA drive though and not IDE.