+1 on Radical Brewing
It's a great book. Though it probably depends upon your personality. If your goal is to rigidly brew to style, Brewing Classic Styles is the book for you. If you view brewing as an outlet for creative expression (and willing to have some fun failures along the way), then Radical Brewing is probably the way to go.
Designing Great Beers can also be fun. It basically gives you percent-based breakdowns for classic styles, so you can just pick numbers within a range. They're not really recipes, but you can make some pretty tasty homebrew that way.