Hi all, I have a fully maxed MBP 15 from 2009 (8GB ram, 3 GHz Core 2 Duo, 500 GB Storage). It has started to show some signs of its age. Not only does the battery need to be replaced, the screen randomly goes black (does not go to sleep, just goes black) and takes a minute or so to turn back on. Also, all the applications randomly freeze to the point that I need to restart the computer. It is also running a little slower than it used to. The above issues, however, only occur maybe once every other week or so. Other than this, it works perfectly fine. That said, I don't want to fully replace my computer until I really have to, but I am starting law school in the fall. I don't want to be in the middle of studying for finals and my computer fail. So I am looking to buy a relatively cheaper backup computer "just in case" that is really portable and light to use in class for taking notes. So... I am torn between the MBA 11 or 13. I will more than likely use the MBP 15 in my room and most of the time I am in the library. I would be using this new computer primarily in class and occasionally in the library. What do you guys recommend? Is the extra cash for the 13 really worth it for me or should I just get the cheapest option possible? Thanks!!