Scorcese's 'Casino' was top class as well, there's no way you cannot put him up there with the best.
Other top directors in my book:
Quentin Tarantino - Reservoir Dogs, Pulp Fiction, Jackie Brown, Kill Bill v1 & 2.
Francis Ford Coppola - Godfather 1 & 2, Apocalypse Now
Brian De Palma - Scarface, The Untouchables....
Anyone know if Tony Kaye, guy who directed American History X, has done anything of note since? That was some film.