HmmMMMM, my favorite book ever is "The Good Thief" followed by "The Unwanteds". But those are books I read as a kid, mostly. I haven't read many books through the years, despite how much I love them. But if you're into graphic novels, I'd suggest reading We3.
It always makes me cry whenever I read it. There's something about the characters' innocence that really gets to you. I'd recommend getting the physical copy, since it's just a couple dollars extra, but since you're asking for Kindle versions, I found it available @ amazon [x].