I second Jan Bussel. He did a wonderful job prepping me to fly my RV7. Jan's training syllabus includes "the impossible turn." He's the kind of flight instructor I've always wanted to be.
I flew with Jan as well. I was trying to get my TW endorsement in a Cub in NJ and just couldn't get the guy's time. So I flew with Jan for about 3 days and got my endorsement and my transition time all at once. Really nice guy.