Read Bob Paris' Gorilla Suit: My Adventures in Bodybuilding and Muscle: Confessions of a Bodybuilder by Samuel Fussell. Both were excellent and actually written by the authors themselves.
Paris' is told partially in flashback as he contemplates coming out of retirement in 95. He talks about what it was like behind the scenes, about drugs, Munzer, Weider, and about growing up gay in a small town. I'm not big on Brokeback-type stories, but his was very well done.
Fussell was a tall skinny Yale-bound geek who was bitten by the bodybuilding bug, made it his entire life for a couple years, and got out.
Also, if you like biographies actually written by the athletes and not ghostwritten like Wheeler's book (or any Flex article supposedly written by a bodybuilder), check out Mick Foley's two books.