Ideally, what I would like would be to be able to buy a paper book, and get the ebook bundled for $X more (say, $2-$5 more). I would have the satisfaction of a book on the shelf, actually owning the book, and then the convenience of an ebook. I would also be less bothered by the presence of DRM. If I could buy DRM-free ebooks from Amazon, I would be willing to pay closer to price parity of the corresponding paper book.