My AlBook 15" came with an 80 GB hard drive, and, well, it's full. Really full. Full to the tune of "I have to restart to get over 1.5 GB free". I have to restart BEFORE running software update otherwise it goes to 0 kb free midway during installation. So, I'm going to get an upgrade. The question, of course, it whether I should get a modest storage enhancement and get the speed boost of a 100 GB 7200 RPM hard drive by Hitachi, or a much higher capacity, but still 5400 RPM hard drive, also by Hitachi. Which one should I get and why?