Which is the best computer to load an AutoCad application?

Autocad, as opposed to SolidWorks, allows for the use of multiple core processors. In general though, the main contributor to having a speedy system is the graphics engine installed in the system.

In my workstation in my home office I run four quad core processors,64 gigs of memory and a blazing fast graphics board (FX-4000) with4 gigs of dedicated memory on board. Two23" monitors complete the setup. I run SolidWorks and Autocad simultaneously all the time with some FEA work running in the background.

Its all about what you can afford...