Ah but there are so many good movies, I don't know where to start..
Angel Heart is a good one as mentioned earlier.
If you like Leone films, be sure to watch Once Upon a Time in the West. Epic western.
Hitchcock films are also a must for you. Vertigo, North by Northwest and Rear Window..
Which leads us to the man behind Starship Troopers. Paul Verhoven, a very
"funny" director. Try to watch Basic Instinct again, now with Ironic Hitchcock glasses. It's great great entertainment.
Did you see Twin Peaks the first season? If you like Lynch.. This is as good as it gets. You can safely skip the second season btw.. But NOT the first!
You saw Enter The Void? It goes well with a joint.
Personally, I like everything by Tarkovsky and Trier, the great great great finnish director Aki Kaurosmaki, Spielberg, and actually I like everything, good or bad!
so yeah..
And documentaries! (almost) everything by Herzog:
The Great Ecstasy of Woodcarver Steiner (1974)
Lessons of Darkness (1992)
Little Dieter Needs to Fly (1997)
My Best Fiend (1999)
Grizzly Man (2005)
Into the Abyss (2011)
La Soufrière
The above are all great, as approved by me.