Who doesn't like Requiem for a Dream? I realize it may not hold to the standard of direct-to-DVD Danish action movies, but it's an intensely stylish movie that does some interesting things as far as attempting to show the audience the effects of being high.
Anyway, they aren't movies, but The Corner
http://imdb.com/title/tt0224853/
and The Wire
http://imdb.com/title/tt0306414/
Seriously, dude, if you listed those The Pusher movies why not include Scarface or Blow?