To get the 2.4GHz MBP over the 2.2GHz MBP if I'm trying to go to college for engineering and if not engineering then Architecture? I hear they do some 3D graphics work and CAD as part of the curriculum. Will the 128 in the 2.2GHz model be sufficient? And if it is, what would the advantages of getting the 2.4GHz 256Mb VRAM model for 500 dollars more. I'm trying to see if the 500 dollars would be worth it for college. If it's worth it I'll do it but if not then I would just get the 2.2GHz model.