- Hardcover? Or paperback?
- Illustrations? Or just text?
- First editions? Or you don’t care?
- Signed by the author? Or not?
That said, I'm happy to go to the Huntington Library in Pasadena and while away a couple of hours looking at the rare books and manuscripts, some of which are truly amazing. They have the Ellesmere manuscript of Chaucer’s The Canterbury Tales (c.1410); a Gutenberg Bible (c.1455), and a bunch of lovely early Shakespeare.
I do have some pet peeves as to cover art. For example, I'm not a big fan of the "movie" editions of books. And I'd rather have a nice, heavyweight paperback than a mass market paperback, mostly because they're more durable.