Just came across this on xxxxxxxxxxxx which would be great as a gaming PC for Xmas:
Advent Centurion CBE1401 reconditioned Desktop Computer (NO monitor included) - Recommended for ultimate computer usage.
* AMD Phenom II X2 550 Black Edition Processor - 3.1 GHz overclocked to 3.4 GHz, 2 GHz HT, 6 MB L3 cache
* 4 GB Memory
* 750 GB Hard Disk
* DVD Rewriter
* ATI HD 5750 Graphics Card
* Windows 7 Home Premium
You need to use Currys Voucher Code 25POUND at the Payment Details stage of the checkout to get it for this price.
Seems a bargain at £374.99 to me.