My suggestion is a customized Sager NP8662 or similar
PC Torque
XoticPC
Deviltech
Sager official webpage
Powernotebooks
There are many more places. You can customize everything, even the warranty and the cover and if you have doubts about the brand, read this:
Who Really Makes Laptops and W ... industries hidden secret)
I was in the same situation this summer, since I'm studying transportation design and I need a powerful but still portable machine (not only graphic design but also intensive 3D modelling) and I bought the MSI GT627 246UK.
Intel Core2Quad Q9000 @ 2.25Ghz (It's a Core2Duo killer, tested :tilt

2x2048mb DDR2 800 CL5 (Usually laptops use 667)
nVidia 9800GS 1024mb (Flasheable to GTS)
WD Scorpio Black Series 320Gb 7200rpm (Usually laptops have 5400rpm drives. It's amazing how fast this one is, and 0db in every moment)
15.4" 1680x1050 Gloss (I was worried about such a big resolution in a 15" screen, but after using it, the only thing I can tell you is that's perfect)
Bluray / HDMI / eSata / WiFi N / Bluetooth 2.0
2.7Kg / 2.5+ hours of battery (with 6 cell, 9 cell available)
MSI GS-502 3200dpi (It saved me to buy a Logitech G9, it's a nice mouse)
MSI Backpack
I love it, it's the perfect laptop
for me and it's running Windows 7 Ultimate x64 like a charm

The American version has Core2Duo at 2.4Ghz, but goes to 2.9Ghz when you press the Turbo button. Sweet

MSI has released a new GT628 with nVidia GT160m and DDR3. The standard version used to cost around 1100$ IIRC