I am ordering an Air tonight, and I cant afford to max out a 13". So what is more important, faster processor (2.0GHz i7, Turbo Boost up to 3.2GHz) or 8gm of ram? Could I get away with 4gb? I use Illustrator a lot for the work I do, and I honestly dont know. Is the 1.8GHz, Turbo Boost up to 2.8GHz sufficient?