Does anyone here use their MBP for CAD at all? I normally use my PC for it but ever since Autodesk released it on OSX I've been trying to use my MBP as much as possible. The problem is it's the top end 13" model from mid 2009. I'm mostly using it for 3D modeling, which it does alright if I don't use realistic styles or try to render. I do however encounter occasional beachballs and crashes, which I can only assume are from the graphic incapability, since my CPU usage isn't all that high. I am considering an upgrade, if it will be worth it. I'm looking into the 15" model because the upgraded graphics, but can't really decide between the lower-end and higher-end model. Does anyone use either model for any sort of CAD? I'd like to know if that $400 would be worth the extra GPU memory.