I thought Gangs of New York was. But the man has made a lot of great films, i'm sure a lot of directors would like to have titles like Taxi Driver, Raging Bull, Goodfellas, Casino, Mean Streets on their resumè.
He is British. I would have to agree with David Lynch, a true visionary and someone who never disappoints. A couple of other personal favorites of mine would be The Coen Brothers, Steven Soderbergh and David Cronenberg (yeah, yeah Canadian but close enough ;)). All unique in their own way and...