I have a huge list of movies I want to watch but haven't found the time for yet, so my list would most likely be different if I had seen them. But here are mine in no order:
À l'intérieur (Inside)
Ip Man
Saw 1
In The Mouth of Madness
Fight Club
Pulp Fiction
The Matrix
Equilibrium
Alien
Martyrs
Honorable mentions: Heat, REC, 28 Days Later, Dead Man's Shoes, Collateral, Die Hard, Bourne Series, Un Prophète (A Prophet)