Hi, My cousin is thinking about buying a MBA 13" 128GB. He will use it for surfing, watch movies etc.... the one thing that im worried about is that he also want's to use it for som CAD. Will this computer work good for CAD? I told him to get the 15" pro with the ATI if we want's to CAD... but he thinks that is a little expensive.. so now he is thinking about getting the MBA or the MBP 13". What do you guys think?