Die Hard-Best Christmas Movie Ever!
I would also add(In No Particular Order):
Goodfellas
The Godfather Parts 1 & 2
Do The Right Thing
The Breakfast Club
High Plains Drifter(Clint Eastwood Western with a Demonic Supernatural Component)
The Long Riders(A Western created by Stacy & Frank Keach on the Jesse James Cole Younger Gang, which I recently watched as I was a fan of Stacy Keach, who played Ken ‘Papa’ Titus in what I thought was the Funniest Darkest Sitcom ever made, Titus, based on the Real Life Dysfunctional Family of Comedian, Christopher Titus that was pulled from Fox despite their 2nd Best Ratings after The Simpsons during it’s 3 Seasons 1999-2001, as it was probably so dark that it crossed the line too much for Network Television, as it should have been on FX, which paved the way for Edgier TV Series during the Early 2000s)
Halloween(although if you take away the Music, it really is not that scary of a Movie, but like in several other cases, the Music can make a Movie Good or even Great)
Indiana Jones and The Last Crusade
Gremlins & Gremlins 2
Back To The Future(1, 2 & 3)
Once Upon a Time in America
Slap Shot
Alien & Aliens
Raging Bull
The Outsiders
Big
Pale Rider
The Omen & The Omen 2
The Deer Hunter
Taxi Driver
Rocky & Rocky 2
Pee Wee’s Big Adventure
Hoosiers
Suspiria(Original)
Chinatown
Planes, Trains and Automobiles
The Wickerman(Christopher Lee mentioned it was his Favorite Movie, that he was a part of with a major role)
The Shining(Stephen King understandably hated it, as the Director, Kubrick veered away from King’s Book and the Original Development of Jack Torrance’s Alcoholism leading to his descent into Madness, but if you take Kubrick’s Shining as it’s own thing, it is still a Great Horror Movie)
Rain Man(Tom Cruise at his Best-IMO, or tied with A Few Good Men, but that is a Post 1990 Movie)
The Sergio Leone Trilogy(A Fistful of Dollars, For a Few Dollars More and The Good, The Bad & The Ugly), which I only discovered a few years ago after doing a deep dive into the Music of Ennio Morricone, who did the Soundtracks to those Movies
You could include most James Bond Movies prior to 1990, although a few are better than others
My Favorite Movies are from the 1990s, but since 1990 was your Cut Off Year, sorry I cannot list them. Although, since Scorsese did a Remake For Cape Fear with De Niro, that was based on an Older Original Movie, which I found more boring, I guess that I could include the Scorsese Remake here that was from the Early 1990s, as it was much more intense compared to the Original Version, which I recently saw for the first time.. I would say the same thing about the Remake of 3:10 To Yuma, as I think the 2007 Version with Christian Bale & Russell Crowe was more entertaining than the Original Version, which I saw last year for the first time, when a Network was showing Old Western Movies