The Ridley Scott classic : BladeRunner (1982) would prob be my pick.
'Out of Africa' (1985) is also tremendous, obviously a very different style of film, a biographical period piece. Great cinematography and acting by Meryl Streep and Redford particularly. Epic music score.
'The Thing' (1982) is one of John Carpenter's absolute best works. Intense movie, great to watch even now. Superb (non-CGI) effects.
Honorable slightly obscure mention : Kinda a small budget indie movie, directed by the inimitable Steve Soderbergh, I've always rather liked 'Sex, Lies and Videotape' (1989). James Spader plays an oddball character and he and Andie MacDowell have a connection.