I think it might be Lyoto. He just had some of the most beautiful strikes, trips, throws, knockouts. All those amazing intercepting knees. The slick ass trips he always pulled off. The snap kick and head kick KOs. The karate blitzing. Lyoto to me is one of the first guys I think of when I want to share the sport with someone who isn't too familiar. The guy has a few of the biggest knockouts in UFC history too, Shadface and Crane kicking Couture. Impeccable technique too.