Bravo Two Zero is a fun read, but not real high on the historical accuracy scale it seems. Andy's squadmates have publicly taken issue with his version of the story.
Blackhawk down is a great read, and is as well-researched a piece of military history as you will find.
I also recommend "We Were Soldiers Once and Young" which bears almost no resemblance to the Hollyweird fantasy piece of the same title.