I plan on using my iPad mini for school. I'm going to get all my textbooks electronically, use pages, keynote, and numbers. I have some music, and quite a few apps. Do you guys think I could use the 32 or a 64 gb iPad? I'm getting wifi only if it matters. For reference, I have a 32 Gb (so what, 28.5 GB in reality?) iPhone and have 20 Gb used.