I played Magnolia last time we were there and had a great time, but the other two courses looked just as nice. It's also the longest of the 3 (Magnolia/Palm/Lake Buena Vista). I've heard good things about each one. I played it at 7K and it was tough enough, I can't imagine going back to 7500.
I'm hoping to get in the other two next time we go. April should be a good time to go, it was a little cold when I played in Feb.