As far as driving Solidworks goes if the moneys not a problem the simplest thing to do is just go for a dell precision laptop. Probably skip the base model and go for the mid range.
I have had 2 of these laptop in the past myself(one lower spec model purchased by myself during uni and another purchased by my employer for me)
The one from the employer used to run 2 24" monitors with Solidworks and Altium running with no problems at all.
If Dell are not an option find yourself the American version of a site like this:http://www.pcspecialist.co.uk/
and build one up to your own spec.
Hope this helps.