Anime Sci-Fi classics that you might already have seen:
Akira (1988)
Ghost in the Shell (1995)
If you’re ok with abstract cinema:
Tetsuo the Iron Man (1989)
Visual appeal:
Metropolis (2001)
Not Sci-Fi, but one of my favorite films of all time:
Cure (1997)
How to make a suckless.org contributor cry