I am planning to purchase one of the new mbp models for university and would like some advice on the matter. (Note: values below are in Australian Dollars) I will be using AutoCAD 2011 quite frequently, but require a portable and affordable laptop. So far my options are the low end 13" with 500GB upgrade ($1342), the high end 13" ($1579) or the low end 15" ($1999). Would the ATI graphics card and quad core make a serious difference to the performance, and is it worth upgrading to 8GB Ram (+ $200)? The problem is that I am still a student and would not like to spend $2000 on a laptop or have the bulk of a 15" laptop. Yet I would still like to future proof it as much as possible. On a separate note, would the better graphics card and processor make any difference for connecting to a large screen? The two monitors I use are 19" and 32". Any advice would be great!