I'm will be going to University in London this fall and am trying to save up for a laptop, Apple ofcourse. I can probally get the money together for an iBook but hope to get enough for a Powerbook. The most demanding program I use is FCP. My question is: How much of a performance difference will there be between a iBook and a Powerbook when it comes to FCP. And keep in mind I use FCP on a G4 400, which is so slow for rendering, that anything would be an improvement.