If you don't know what you'd do with one, then don't buy it.
I personally have reasons why I don't want to buy a huge capacity iPhone/iPad. One of them is that if it breaks, it breaks and there goes all my music, pictures, and apps. So I like having it all separated. I'd rather reload apps than I would music. It's a PITA, especially when you have to decide which tracks go in since my library doesn't even fit into the classic - And yes, I CAN tell the difference, so I can't downgrade tracks.
I use my iPod Nano for music, counting my steps, podcasts, listening to the radio, audiobooks, and iTunes U content. I also use the photo app for viewing flashcards that I make on Quizlet, export as PDF, and then JPG.
But if you're not into any of that, then it'll just be something that sits in your drawer. So really think about it before you spend the money.