What's the Best Computer and/or Laptop for 3d Modeling and BIM ...

My recent recommendation has been the 15″ HP elite book. At CASE we have one of the 17″ versions and although it's pretty big, it has been a great machine. Fed, Steve and I work on Dell Precisions M4400(s). We have had mixed results….. Fed's hard drive failed, ..... What a difference. . . .since no i7 level chips are out for laptops, and laptop ram (in any configuration over 4GB) would be prohibitively expensive, I'd suggest the two-system solution mentioned above. ...