It's not entirely on-topic, since it's not an active rider, but I wonder what the Clinic thinks about Thorwald Venenberg. Rode for Rabobank in the early 00s, yet didn't achieve anything at all. I always liked this rider. Might he be another one to have gone down for not wanting to dope?
As for the current peloton, I have to admit being rather pessimistic. There seems to be a lot going on that shouldn't. I expect there to be some riders who don't dope, but giving actual names? Isn't that a bit too hard a question?