The first course I took was with Racing Adventures -
http://racingadventures.com/. I've known the owner for a long time (he was a customer of mine back in the day when I had a speed shop) and the course is pretty decent for the money. It may not be Bonduraunt or Skippy School but its good instruction in someone else's (well prepared) car. I did the corvette but most guys in my school did the cobras.