Help me find a cheap gaming pc in the UK

Hey,

I've had my current PC for around 4 years now. The specs are 128mb radeon 9800 pro and AMD 2500 barton with 1GB Ram.

As you can see it certaintly become a relic by todays standards and I'm looking to upgrade, the problem is I dont know anything about the current hardware market and so I don't know when a website is charging well over the price just because their building the PC.

I'm looking to spend no more than £400 on my new pc, no need for a new monitor. Is there anyone that can link me to a website which charges a fair price (Like £50 plus the parts).

Also, what kind of PC will I be getting for that price? I want a fairly good one which will be able to handle Age of Conan at high settings comfortably.

Thanks alot, I'm only interested in UK websites though but advice would still be appreciated from the american guys