Hi Amy,
I think core synergistics is awesome! It's really tough and it gets my heartrate up. It includes all kinds of non-crunch moves. Some that come to mind are:
Superman-Banana: Start on your stomach, in superman pose, then roll over onto your back, trying to keep your arms and legs off the floor the whole time. Go back and forth.
Dreya rolls: From a standing position, sit down on the floor and roll back to your shoulders. Then roll back up and stand up (or jump! if you're able to).
I wouldn't really recommend Cardio outside of using it with the whole set. It's great for doing P90X, because you want to do lower intensity cardio so you don't lose muscle. I don't think it's that much fun, but hopefully you'll get other opinions. I don't dislike it, but I don't love it. It starts with some yoga, and then kenpo (karate moves, really simple), and then plyometrics.
I wish you could watch clips! That's a big problem for me with Beach Body. They really should come into modern day e-tailing and let us see a preview!
Good luck!
Tonya