I find this a very interesting thread. I am in awe of the likes of the Stoner's, Rossi's, Toselands, etc, etc but my daughter and I agree that the bravest riders EVER are those who chose to compete at the TT at any level, in any division.
Those who compete on Road (something we don't have in Australia) and Circuit deserve special acknowledgement. Regardless of what some of us think of Carl F. he achieved in both codes and I don't think anyone has mentioned Rob McElnea. I watched him race in Australia on what you would call 'circuit' and I was informed by an ex English all rounder that, in his opinion, Rob was one of the most versatile he had seen (this was back in 1990 I must add).