How do you decide what to collect?

Hey everyone. I love movies and a few years back I sold almost all my Blu Rays due to lack of space. I've decided to at least pick up some of my favorite movies in steelbooks, but shopping around I can see this becoming a massive addiction, because even bad movies have awesome steelbooks, lol.

So what and how do you collect? Only steels from movies you love? Gotta Catch 'em all? Do you buy the different steels of the same movie?

So far I've ordered 3 steelbooks of movies I love / have meaning to me:

Black Hawk Down Kingdom of Heaven Serenity.

Cheers.