I realize this question has been asked several times (and I have checked them), but I would really like some more feedback... I'm looking at the 15" PowerBook 1.67 GHz. With the release of Tiger and the increasing dependency on the GPU to carry out much of the graphics processing, what will 64 VRAM vs. 128 VRAM accomplish? I am interested in using the PowerBook for a great deal of programming, but I'm not particularly interested in PhotoShop, Illustrator, etc. What I basically want is a computer that will survive 2 or 3 years without really being bogged down by being a little bit older. Thanks for all your advice!