I have played most of the courses talked about here, and none of the choices is a bad one. Couple things to consider:
At Disney, Palm and Magnolia are the "tour" courses, so you can't go wrong. My opinion, Magnolia is best of those two. Golf Chick's mention of Falcon's Fire is also a good one, and it's a lovely track just across from the Marriott complex.
Another I would add to your choices is the "New" Course at the Hyatt Grand. It's a Nicklaus replica of the "Old" Course. Really great track and always highly regarded.
The only issue with Champions Gate is that you do have to drive a bit to get there. Lovely course, but if you're pressed for time, the other courses we mentioned are closer in.
Have fun and play well.