This list is always in flux but here goes...
Classic favorites:
John Carpenter's The Thing
Taxi Driver
A Clockwork Orange
Seven Samurai
Yojimbo/Sanjuro
Rosemary's Baby
The Big Lebowski
Newer favorites:
Hereditary
The Witch
Notable mention: I just watched a film last night called The Eyes of My Mother that I really enjoyed. I love slow burn films that are heavy on dread.
- - - Updated - - -
Blade Runner is a solid pick!