Are you in school now? or going to be? Either way if you go to a college with an engineering program chances are they will have several computer labs with desktops more then capable of running any CAD/Computation software the college uses. So considering this buying a laptop for cad work is a non neccecity as it will take longer to do on a laptop and you will probably have to plug in as CAD can be resource intensive. So I would suggest looking for something that is very portable/long battery life/ and in your budget instead.