Hi everyone I currently use a 4 year old MBP with an X1600 GPU. Thinking about going for an Air, and wondering what the 320M is like in comparison. I play the occasional game but principally would use the machine as a holiday / travel laptop and would hope to be able to do light 3D graphics work on it. I know it's never going to replace a desktop machine but I'm quite good at working within hardware constraints. Is the 320M a much better GPU? If so by what order of magnitude?