Samsung Galaxy Note 10.1 2014 is actually looking quite decent to me. $260-300 used, large screen (9 inches would be minimum for reading textbooks/sheet music), nice resolution. I've never used a Samsung device before though so I'm not sure how I feel about their UX/UI. I've always been moderately turned off by what I've seen of others' Samsung phone.
Posted via the Android Central App on my 2014 Moto X