I agree with the people saying go to your local Apple Store and test it out. If you're concerned about After Effects speed, take a project you did and burn it to CD and bring it down with you. They should have AE installed by default on the PowerBook, at least it is in the bay area at all the stores I've been at. Load up the project and start rendering. If it seems too slow to you, then don't get it. Also they have lots of other applications that you can play around in to feel the speed. If you decide not to get it, then at least you can feel sure that you made the right choice based on your feelings of the computer, and not somebody elses.