I have a Current Generation 14' iBook, G4 1.33Ghz, 768MB RAM, Radeon 9200 32MB, and the default 60GB 4200rpm Hard Drive. How much performance would I stand to gain from a 7200rpm Drive? I am not concerned with battery life or anything, just speed. Would it be a worth while upgrade? or should I just leave it as it is until Its time for a new computer?