So I just acquired my mom's PowerBook G4 17" - it's the original 1ghz one with the 4200rpm drive. She bought a MBP as replacement which is awesome I must say (and doesn't moo). I do some video editing in FCP, lots of Photoshop, and I play X-Plane a lot which contains 8 gigs of scenery. What sort of gains can I expect from a 7200rpm drive replacement? Specifically, the Seagate 100gb option.