Motherboard Asus P5B-VM iG965 £69.47
http://www.scan.co.uk/Products/ProductInfo...roductID=462645
You might not be able to overclock it that well but a nice choice.
Processor Intel Core 2 Duo E6600 Socket 775 2.4GHz £139.68
http://www.dabs.com/productview.aspx?Quicklinx=44HD
Perhaps still the best processor on the market for those with a decent limit, overclocks very nicely. Lower core2 processors have less cache (which can make a nice bit of difference, especially with multithreaded apps, so be warned.
RAM GeIL 2GB (2x1GB) PC6400C5 800MHz Value DDR2 £54.04
http://www.overclockers.co.uk/showproduct....rodid=MY-064-GL
"Value" ram goes against most of what I believe in but go it, again serious overclocking might be a problem.
Hard Drive 250GB Samsung SpinPoint P120, SATA300 £37.60
http://www.scan.co.uk/Products/ProductInfo...roductID=247245
If you can find a SATA 150 you will likely not see the difference and I would say go bigger if you can.
Graphics 256MB XFX 7900GS, Mem 1320 MHz, GPU 450 MHz £91.40
http://www.scan.co.uk/Products/ProductInfo...roductID=499273
Should play most of the latest and greatest in sensible resolution. You might be able to get a better card though and maybe even the lowest of low in directx10 (not worth it in my opinion) for £10 more
Optical Drive Samsung DVD+-R/RW SATA LightScribe Black £18.78
http://www.dabs.com/productview.aspx?Quicklinx=4J7X
drive=drive=drive
Case Casecom Black Mid Tower Case £17.99
http://www.ebuyer.com/UK/product/115479
PSU 500W AKASA Ultra quiet Active PFC ATX 2.2 £52.75
http://www.scan.co.uk/Products/ProductInfo...roductID=465703
Upgrading may be a pain as you are right one the limit and do not make an SLI rig in the future (your board will not do it either), fine otherwise.
Cooling Arctic Cooling Freezer 7 Pro £15.97
http://www.scan.co.uk/products/productinfo...roductID=340995
No need in my opinion (spend the extra on a bigger HDD), the stock cooler is pretty good in this regard.
Sound Yatai 5.1 Black/Silver 33W RMS Surround Sound £29.99
http://www.ebuyer.com/UK/product/122903
Try looking at the specs for your motherboard harder: 1 x 7.1 Audio I/O, ASUS do decent onboard sound as well.
Card Reader Enlight Black 26-in-1 Internal 3.5" Card Reader £8.98
http://www.ebuyer.com/UK/product/125247
To each their own.
Game Valve Complete Pack £40.00
http://www.steampowered.com/v/index.php?ar...&SubId=81&cc=GB
Same again.
2nd Screen 19" Daewoo Widescreen LCD Monitor 1440x900 £117.37
http://www.scan.co.uk/Products/ProductInfo...roductID=534302
I do not get monitors often enough to comment.
As a final note might I also suggest a decent keyboard and mouse: for all that is under the hood what you actually deal with is the mouse, monitor and keyboard.