Order does not matter, I do not want to "diminish" any of them.

12 Angry Men (1957) - http://www.imdb.com/title/tt0050083/
The Shawshank Redemption (1994) - http://www.imdb.com/title/tt0111161/
A Clockwork Orange (1971) - http://www.imdb.com/title/tt0066921/
The Elephant Man (1980) - http://www.imdb.com/title/tt0080678/
The Godfather (1972) - http://www.imdb.com/title/tt0068646/
The Godfather: Part II (1974) - http://www.imdb.com/title/tt0071562/
No Country for Old Men (2007) - http://www.imdb.com/title/tt0477348/
Se7en (1995) - http://www.imdb.com/title/tt0114369/
Shutter Island (2010) - http://www.imdb.com/title/tt1130884/
Psycho (1960) - http://www.imdb.com/title/tt0054215/
American Beauty (1999) - http://www.imdb.com/title/tt0169547/
Memento (2000) - http://www.imdb.com/title/tt0209144/
The Usual Suspects (1995) - http://www.imdb.com/title/tt0114814/
Who Am I - Kein System ist sicher (2014) - http://www.imdb.com/title/tt3042408/
Gran Torino (2008) - http://www.imdb.com/title/tt1205489/
The Green Mile (1999) - http://www.imdb.com/title/tt0120689/
There Will Be Blood (2007) - http://www.imdb.com/title/tt0469494/
The Machinist (2004) - http://www.imdb.com/title/tt0361862/
The Shining (1980) - http://www.imdb.com/title/tt0081505/
The Exorcist (1973) - http://www.imdb.com/title/tt0070047/
Braveheart (1995) - http://www.imdb.com/title/tt0112573/
Gladiator (2000) - http://www.imdb.com/title/tt0172495/
Primal Fear (1996) - http://www.imdb.com/title/tt0117381/
The Devil's Advocate (1997) - http://www.imdb.com/title/tt0118971/
Scarface (1983) - http://www.imdb.com/title/tt0086250/
Nightcrawler (2014) - http://www.imdb.com/title/tt2872718/
Oldboy (2003) - http://www.imdb.com/title/tt0364569/
Memories of Murder (2003) - http://www.imdb.com/title/tt0353969/
A Bittersweet life (2005) - http://www.imdb.com/title/tt0456912/
The Man from Nowhere (2010) - http://www.imdb.com/title/tt1527788/
I saw the devil (2010) - http://www.imdb.com/title/tt1588170/
Leon The Professional (1994) - http://www.imdb.com/title/tt0110413/
Once Upon a Time in America (1984) - http://www.imdb.com/title/tt0087843/
Pulp Fiction (1994) - http://www.imdb.com/title/tt0110912/
Reservoir Dogs (1993) - http://www.imdb.com/title/tt0105236/
The Hateful Eight (2015) - http://www.imdb.com/title/tt3460252/
Sergio Leone Dollars Trilogy - http://www.imdb.com/title/tt0058461/ http://www.imdb.com/title/tt0059578/ http://www.imdb.com/title/tt0060196/

great list @Jogos

Like all listed except a few I have't seen yet..