Sorry for such a long list chef, hopefully you've seen some of these so can whittle it down quickly:
The Lives of Others - this is really very good if you haven't seen it
Michael Clayton - also surprisingly good
The Kite Runner
Zero Dark Thirty
Inception
Frost Nixon
Tinker Tailor Soldier Spy
Fight Club
K-Pax
The Sixth Sense
The Proposition
Sexy Beast
Lucky Number Slevin
Girl with the Dragon Tattoo trilogy
The Assassination of Jesse James by the Coward Robert Ford
Oh Brother Where Art Thou
Midnight Run
For some romp-around violence with humour:
Pulp Fiction
Kick Ass (n.b. not KA 2)
God Bless America (well, I liked it, a lot)
Old Boy
Inglorious Basterds
The Lives of Others - this is really very good if you haven't seen it
Michael Clayton - also surprisingly good
The Kite Runner
Zero Dark Thirty
Inception
Frost Nixon
Tinker Tailor Soldier Spy
Fight Club
K-Pax
The Sixth Sense
The Proposition
Sexy Beast
Lucky Number Slevin
Girl with the Dragon Tattoo trilogy
The Assassination of Jesse James by the Coward Robert Ford
Oh Brother Where Art Thou
Midnight Run
For some romp-around violence with humour:
Pulp Fiction
Kick Ass (n.b. not KA 2)
God Bless America (well, I liked it, a lot)
Old Boy
Inglorious Basterds
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