I'd recommend Cory's school as well; I only mentioned the Sitton school as it does have wing class emphasis. I took the Cory's intermediate course about 12 years ago and my only regret is that I didn't take one of the advanced courses.
An interesting side note is that my video of that day was shot by a fledgeling lensman by the name of Sean Buckley, a fellow I've known since he was too young to get into the pits at Ventura.