Well, if you are looking to do Atkins, I would recommend "Dr. Atkins' New Diet Revolution". The Zone is a different sort of diet, focused on balance in the proportions 40% carbs- 30% fat- 30% protein.

If you are already cooking Atkins style, his book would be a great one to read. Atkins for Life is good, but talks more about maintenance than the beginning phases.

Hope you find something right for you. Good luck!