May I ask first why you're spending that absurd amount of money on a computer?... whatever.
Intel Quad Core Extreme Kentsfield QX6800 I think? (Though Core 2 Extreme is arguably better, unless you plan to play like 5 games simultaneously.
SLI 2x GeForce8800GTX (Though technically the 8800 Ultra would be better, it isn't out for the public though)
ASUS Striker Mobo
Creative X-Fi Fatality Sound Card
4x 1.5 Terabyte HDD (Or Raptors)
Corsair 4x1GB Corsair XMS2 Dominator
2x Blu Ray Drives
OCZ 700W GameXstream
This is just off the top of my head... you're gonna need better cooling too.. I get the strange feeling though that you just want to see examples of the best hardware out there, no one spends 8000 british pounds on a computer, that's just ridiculous.