try
www.cclonline.com order the parts from them and they build it for you for £70 and you get 1 year warranty.
budget spec:
Q6600 £145
512mb 8800gt £125
Asus P5k-SE £60
500GB Samsung HD £45
2 GB Corsair 800mhz ram £30
Pioneer CD/DVD £17
520W Corsair modular PSU £68
Vista 64-bit £60
Case - Antec 300 £35
Cost so far £585
22" monitor ~ £150
keyboard/ mouse £10
cost to build £70
Total cost £815
or if want to spend bit extra for better performance and overclock:
Q6600 OEM £135
Scythe Ninja Plus CPU cooler £30
512mb 8800gt £125
Asus P5K-E £90
500GB Samsung HD £45
4 GB Corsair 800mhz ram £55
Pioneer CD/DVD £17
520W Corsair modular PSU £68
Vista 64-bit £60
Case - Antec 900 £65
Cost so far £690
same accessories:
total cost £920