Anthony, Im not sure how much your willing to spend, but if money is no object, I suggest you check out a few of these (Im not a big fan of Dell ;) )
I bought a laptop a couple of years back of this site, (which I still have and use)
They specialise in Laptops for audio production, but afaik they all feature dothan technology, and now come with some form of ATi PCI Express card.
I think these are little more expensive, but they have a few Laptops that feature Dual nVidia (SLi-based) cards
You could also have a look at this site, its a list of certified SLi Partners (scroll down to the bottom for a list of Laptop retailers)
If any others come to mind, Ill let you know.