I'm looking into getting a new MBP in a few months before I leave for college. I'm majoring in architecture so I will likely be using Revit and AutoCAD quite a bit. Therefore, I was wondering if I should get the 15" MBP with the i5 or the i7? I think the i5 processor would be fine for running those applications but it only comes with a 256MB graphics card. Will a 256MB graphics card with the i5 run these programs fine or would I be better off with the i7 and 512MB graphics card? Also, I currently have a 13" MBP (2.53 GHz C2D, 4GB ram, 250gig HD) that I got in December so I would sell that and use that money for the new MBP. Any ideas on how much I could get for it? Its still in really great shape. Thanks!