I bought the Cyclist's Training Bible .
It's as advanced as it gets. It assumes that you participate / have participated in races, will make your life revolve around cycling, will train all year long and own / want to own a power meter.
It has a yearly training plan, self-assessment tests, suggested workouts and nutrition information. It basically shows you how to train like a pro athlete.

I don't own any other training books but it seems to be directed at only the most serious people who are interested in racing.