I am thinking on attending law school next fall and need to purchase a new laptop. Right now I have a 12'' ibook G4 and love the portability but would like a little bit more power out of a little computer. So, I'm looking at the Macbook line for purchase early next year / summer. I'm sticking with that line because I think 15" is just too bulky to be hauling around everywhere I go and I definitely don't need that kind of power. My question is: When choosing between the 2.0 and 2.16 Ghz processors in the MacBook would I notice a substantial difference in speed when running the Mac OS (leopard when released) and when running Vista, if I chose to do so? I kind of figured their wouldnt be a lot of difference based on processor speed and as long as I upgraded to two gigs of RAM i'd be fine running either OS, but I wanted some more "expert" advice before starting to budget for the computer. I would only be running Vista rarely to play around with some of the features, not for any functional purpose. I'm assuming there will be one more upgrade to the macbook line before I make a purchase but my main concern is whether to step it up from the entry level macbook based on today's specs. Thanks everyone!