It's hard to know what to recommend to you, because I don't know anything about you and what kind of diver you intend to be.
If you are interested in an accessible reference with a lot of information on a variety of topics, the PADI Encyclopedia is actually a very nicely put together book.
If you are looking for something to fill in some knowledge "holes" after an OW class, Clay Coleman's Certified Diver's Handbook is a very nice book, with a lot of good information to help a new diver get out there and actually DO some diving.
The Navy manual and the NOAA manual are excellent, thorough references, but not particularly readable. And if you are interested in specific topics (decompression theory, diving physiology, etc.) there are other, more focused books that could be recommended.
If you like books, I suspect you will end up with more than ONE book on diving . . .