Crossfire 3870's or SLI 9800 GT's and a C2Q extreme in a laptop?
I'd be surprised if those got 30 minutes of battery life even with the largest battery you can get for it.
Honestly, gaming laptops suck. They get horrible battery life and are very uncomfortable to use. I'd buy a SFF desktop for gaming if it needs to be portable and a regular non-gaming laptop for mobile use.