I am short 33 books right now. I have taken many of your suggestions and have based many of my picks on if I can get them on audio or not. I have 98% of the books on my list on audio already. The books that I am having a hard time find, I think I will end up getting a subscription to audible.com for the rest, because, well, they have everything on audio.
So please keep up the suggestions. I am having a great time looking for the books, however I am quiet sure I will have an even better time reading them :)