What are some of the best books related to Machine Learning?

This sub has tons of posts on free books related to machine learning, but I just don't know how many of them are good.

Posts like these http://redd.it/2anzao and http://redd.it/1jeawf give dozens of books to read, but I don't know which ones to pick.

So what is the sub's opinion on some of the best book?

Note: The book does not have to be free. I would prefer books of all levels, introductory to advanced.

EDIT: I just saw this http://www.reddit.com/r/MachineLearning/comments/20i0vi/meta_collection_of_links_for_beginners_faq/ but this applies to beginner books so I guess show me your favorite moderate/advanced books.