Which laptop is best use for running cad software like solidworks?

I would use something with a Intel Duo core processer, minimum of 2gig or ram, 4 or more preferably, Windows XP (vista sucks and is a rescourse hog) 512 video card. I am not sure they make CAD video cards for laptops because they are usually freaking huge so you might have to settle for a gamming video card. Hard drive I would go with nothing less than 7200 RPM if you can.