don't focus on your abs.. focus on your body. your body works as one unit, and your abs are only part of your body. Rippetoes is an excellent program you should definately look into; it is something like this:
Day A
3x5 Squat
3x5 bench
1x5 deadlift
Day B
3x5 Squat
3x5 Overhead Press
3x5 Row/Clean
I believe that squatting works the most muscles of any movement (someone correct me if i am wrong).. it works your legs better than anything, and helps your stabilizer muscles in your back/arms.. deadlifting also works your legs/back/arms.. those 2 exercises are the best.benching is great for your upper body (i am sure you know)..
then on Day B, we once again have the squat (the foundation of the routine), overhead press, which mainly helps your shoulders, but again it's a sick exercise and a lot of people like it more than benching.. Rows/Cleans it's your choice.. cleans are really good and they will help make your more explosive.
also, you can add in dips/chinups to Day A/B respectively if you want to do some more, but those exercises are the best because they work the most body parts.. just eat right (eat a lot if you want to build muscle, less if you want to lose weight), get an adequate amount of rest, and switch off everyday from workouts A and B.. for example
Mon: A
Tues: Rest
Wed: B
Thurs: Rest
etc etc