I am getting a new powerbook soon and I know it will be a 15 inch combo. I am going to be recording music on it from my guitar and will be using Garage band fairly heavily. Does the difference betweeen the 1.33 ghz and 1.5 ghz proccessors make a huge difference in performance? If I get the higher end I will downgrade everything except the ram which will be 512. I will also go at the fastest hard drive speed on both. I guess what it comes down to is, is the speed bumb enough to justify spending 200 more to get 128 mb video ram for games, and a faster proccessor speed. I will be also playing games quite a bit, such as halo.