Actually if you want lots of recommendations (or at least see some of what is out there try this website - nothing written in the last sven years but some great classics amongst the trash)
http://www.boat-links.com/books/nfl/nautfic-01.html
But for non-fiction Blair's two books on the Atlantic Campaign are up there on most peoples lists (although he does seem to have a rather pro-American slant as I recall).
Malcolm