I'm trying to decide whether or not to get the 15" or 17" MBP based on the amount of RAM I can get in the machine. Is it possible to put 8 gigs of RAM in the 15" or is it maxed out at 4? Should preface by saying that I'm not tech savvy- I can install RAM but that's about as far as it goes (and I have no programming skills at all). The laptop will be used for audio software and I'd like it to last at least 3 years. The 8 gigs possible on the 17" is attractive, even though I prefer the smaller screen, because it's a machine that can grow over the next couple of years as software gets more cpu intensive. Thanks for the help.