Here is my attempt. I tend to be impressed by expansive conceptual presentations, films which tap into human nature, but also present an extrapolation into the effects of individual action amplified as humanity. Ideally, a clean synthesis of visual and story + concept is key, one striking element of the following is a sense of scale they present.

My choices:

Zardoz
The Lathe of Heaven
2001
Planet of the Apes
Blade Runner
Once Upon a Time in the West
The Illustrated Man
Omega Man
1984
Before Sunset

Personally, the radically differing techniques of these films inspires me. I'm sure it may seem like an odd mix!