I'd be Big Lebowski, Fargo joint top then Barton Fink then No Country.No Country For Old Men. One of the best movies of the last decade and one of the best of the Coen brothers career. Fargo still takes that honour though, closely followed by this and Miller's Crossing with an honourable mention for A Serious Man.
The Fog - 1980 version. Creepy as fuck. Man, Carpenter knows how to create suspense. Quality stuff.