Hi everyone, I am about to take the plunge and purchase my first mac. It will be a MBP, 15 inch as soon as the Merom processor comes out. I plan on purchasing 1gb RAM from a third party and installing it myself. My question is is it possible to upgrade the harddrive down the road? It looks like the baseline configuration is 80gb. I'm in grad school so will be saving all my data (mostly pictures and excel files) not to mention my thesis (really excited about Time Machine next year!). If I can't upgrade the harddrive on the computer, is it better to buy an external harddrive when I get to the point where mine is filling up? Or should I simply purchase the MBP with a larger harddrive now? I'm on a student stipend (thank you very much to all the tax payers who support me!) so if I can delay purchases and spread the money out it helps, but I don't want to compromise this very large purchase. Thanks all for your advice! I'm looking forward to saying goodby to my 5 year old windows laptop (which has had a pink screen for the past 8 months - my computer's version of internal bleeeding) and saying hello to my new MBP!