Gaming Keyboard, Mouse, a 20" monitor (either Dell or Gateway), speakers (from either Creative or Logitech), the computer with all of the listed components, and a liquid-cooling system, and the price is already with shipping.
Ask your UK dealers if they can meet that.
P.S.: Oh, and the PSU would be from either Antec, Corsair, or OCZ. You can choose ANY case you want, since the system is liquid-cooled. Oh, and ask if your UK dealers can pre-guarantee you a good OC chip that can get to such clocks stable. I mean... 3.6GHz 45nm quad.
The key difference is... I can guarantee you that the system will work at the promised clocks 24/7, and you can freely choose the components.