One of the dirtiest moves I can ever remember was the Compton/Stead PLRC final that was on tele. Infact the Sheffield '99 top 4 of Wilson, Compton, Stead and Smith must be one of the hardest/dirtiest top 4s ever! And Stead is almost saintly too! Scud Smith, the only rider I've seen wipe out 3 riders in 1 race in 3 separate moved
Vissing is a nut job though and Gathercole has a screw loose.
All riders mention in this post as being dirty/hard while maybe not top of my list of favourites are riders I'd happily pay to watch.