Desktop PC on Pixmania - looks almost too good to be true in my opinion it's being sold by one of their associates: SmartBuy.
Theres very few details on the site for some reason witch is strange but a quick look around the internet reveals:
* Intel Core 2 Quad Q6600 Processor (2.4GHz, 1066MHz FSB, 8MBCache)
* 400GB Hard Drive
* 2GB Memory
* Genuine Windows Vista (R) Home Premium
* 6 USB Connections
* nVidia GeForce 8500GT Graphics
* Multi-Format Dual Layer DVD Re-Writer
* TV Tuner
To be the standard
It's unclear wether it comes with a monitor or not
Have a look for yourself.
also pixmania have 5% off all orders under £400 until December 17th at midnight
don't worry if miss that they appear to have Discount codes on all the time