[Wyatt]

Paul, the Music folder in your home folder on your Mac also includes all your iTunes content, including apps and iBook books. When you're looking in iTunes, you're only seeing the music library.

If you want to have all your music on there, plus plenty of room to grow, I'd recommend the 64GB iPad for you. You could make do with the 32GB model, but once you start adding in a bunch of new apps and new music, you may find yourself wishing you had bought the 64.