So I bought a 64GB SP2, and I was installing the Windows update and realized that the available space is only 27GB of 53.3GB... This is cool with me because I'm going to be using this device only as a note-taking tablet. However, I'm really worried about the future updates. How often do they release new updates? and can my SP2 eventually run out of space from installing the updates? I'm not sure if I should spend just $90 more and get the 128GB one. I'm worried about getting a defective device the one I have now is perfect.. other than the storage problem.