Here is my situation. I am currently saving up for a MacBook Pro (or iMac). I will only use it for YouTube, papers because I'm going to be a Freshman next year, and light Internet usage. I use to have a 15" Acer laptop and it wasn't very portable so I'm looking for a portable laptop. I also want one that loads fast as my old laptop was slow. With all this inconsideration and since I have an iPad which do you think will be best for me; the 13.3" low or high end model, 15" low end model, or the 21.5" low end model iMac?