you can buy a C90 today that has the 8600GT, 15.4" Lcd, a Conroe Desktop CPu! and a bunch more the thing is probably the fastest laptop available. www.milestonepc.com
has em for $1050!!! its a barebone but all you need to add is the RAM/CPU/HD which will run you $250-400 if youre smart. You can get an E6400 cpu for $150 on ebay thats faster then any laptop cpu costing $500+ it uses a standard laptop hd E-Sata and 667mhz laptop ram. The laptop does look amazing, its beefy though and isnt the most portable thing. The desktop cpu does take more power and the 8600GT is a power hogging beast so if you dont mind having it connected to the wall most of the time this laptop is amazing.
You can probably build it if you source out the parts on ebay for $1300, that will be faster then any Dell laptop. wow i never thought of that.... you would have the FASTEST laptop made. Also the laptop is billed as one of the most upgradeable laptops i guess everything will be upgradeable down the road including the video card, the cpu,lcd, and battery.