I just bought a refurbed 2ghz core duo macbook. I am going to get 2gb of ram for it but not sure where I can find this for the cheapest price. Plus I think I want to upgrade the hard drive. Is it worth trying to find a 7200rpm drive? Will that also make the computer run quicker and snappier? I also want to get a case, something between a sleeve and a case would be great, so I can put it in my backpack and not worry about dropping the backpack to the ground a few inches. Any ideas? Thanks!