In the market to purchase my first iPad. I am a college student and looking to use it for eBooks, PDFs, standard browsing and app use. Taking/storing photos and storing tons of songs is not something I plan to do a lot of (keeping that for iPhone) so I don't believe a lot of storage is necessary for me. I'm debating between the refurbished iPad 4 ($379 16GB, $449 32GB) and the iPad Air ($499 16GB). Which is the better value? Worth the extra dollars for the Air?