I'll be buying a macbook sometime in the near future, and was wondering if I should settle for the lesser 80 gig harddrive and just change it later. I know for a fact that I want more than 80 gigs (maybe like 150 or something) and I dont want an external hard drive. So, if I get the 80 gig HD with it, would I be able to buy a harddrive online and replace it myself? Do you need to get a specific type of harddrive for a mac (like, are they the same ones as PC hard drives?), whats the biggest I could get and for how much, and what are the cheapest places to get them? Also, I completely suck with computers and hardware and all that... would it be easy for a guy like me to replace it myself? Would I need to get someone else to do it, and if so is it cheap to get it done? Any info on this stuff is greatly appreciated. Thanks!