Hello, I am planning to study for the MCAT in the spring of 2012 and was wondering what would be better? An 11" or a 13" also I was wondering if I would still need my ipad 2? I mainly use it for reading, and I was wondering if Inkling app is available on the Mac App store for OSX? I plan to buy my textbooks from them, but they are only available for the iPad. Ideally I would only want one machine to carry around.