10 Best Movies Pre-1980 on blu-ray

[djkest]

I'm a young guy and I haven't seen a lot of old movies. I'm wondering what "classics" I need to pick up and check out. I'd like to start with movies that are either already released or scheduled for release. So far I've got a couple on my list...

1) Wizard of Oz
2) Casablanca
3) Alien (1979)
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What do you think? If you have suggestions, it might be helpful to explain why the movie is a classic worthy of continued attention

Edit: Other suggestions multiple times
A Clockwork Orange
2001: A space odessey
Citizen Kane
Maltese Falcon
Seven Samurai
The Godfather: I, II
Star Wars
Taxi Driver
Dr. Strangelove: Or How I Learned to Stop Worrying and Love the Bomb7)