I will also vouch for hard drive performance being very important to overall performance. A while back I had a Power Mac G4 and I actually noticed an improvement moving from a 7200 RPM 2MB cache hard drive to a 7200 RPM 8MB cache hard drive (both of the same capacity and made by the same company too). If there's a noticeable difference there, then I'm sure it helps a lot to have a fast hard drive in a laptop.
Actually, I'll be going laptop HD shopping reasonably soon (for a TiBook, so I can replace the drive myself) and I'll probably go with either an 80 GB 5400 RPM or a 60 GB 7200 RPM, assuming the price isn't too high for the latter.
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