If mac wasnt a choice, I'd sue Microsoft for antitrust purposes. just kidding. i'd choose a dell xps or an hp. alienware is also a good choice. although alienware is designed for gaming... but CAD won't put much of a dent on the cpu usage. so in short, i'd go for alienware, if not an option, then hp, and then dell xps. if there wasnt a mac. macs my first option, since 4GB ram is plenty to run vmware fusion and the macbook pro has a great gpu and cpu. For those of you still saying nivida gpu = death, its not true. they said the older units have gpu failure, the gpus just fabricated are clean of defects.