Have you ever tried Body for Life?

It is an intense workout program that really well help to lower body fat. You can either follow thier nutritional plan which is low fat high carb, or some follow a low carb plan while using the workout and meal schedules. Combine that with the ab bootcamp and you will see and feel differences.

You might also look into the Zone diet. Apperently it is used by athletes alot. It combines 40% carbs, 30% protien and 30% fat.

What ever you choose to push your body fat that low and get great definition youwill have to follow a strict nutritional plan as well as a strict workout regiment. You might look at getting a trainer, though sometimes those can be more a pain then help.