Check out the inland boards, the blue lake or red woody. They both are bigger, but still perform pretty well. I know lance uses the blue lake and gets air pretty well. Inland has a dvd where they show their boards being ridden pretty well.
The other option is to go to someone like TWP or SMED to build you a board at a custom size.
Stay away from boards like the landlock, they are bigger, and will float you well, but they do not perform. Great for learning, not much after.