I have re-read quite a few books, but the one that stands out (pun not intended) is Stephen King's The Stand. I really enjoyed it the first time I read it and then he re-released it many years later with several hundred new pages added back in. The second release was the way he had actually intended the book to be the first time, but because he was a relative unknown when it was released they edited it down to around 850 pages. He re-released it much later after he became so successful, with the original content, which was closer to 1,200 pages. I enjoyed it even more the second time.