Rules of Attraction
The thing's overstuffed with film geekery. The kind of film that invites you to rewind certain scenes just to get a closer look, like trying to figure out how a magic trick is done.
It's got one of the most beautiful suicide scenes I've ever seen.
Here's a good article from the AV Club, on the cult status of the film.
Jesus, I'd like to see Avary's "Glitterati".