Heat
Layer Cake
Copland
and The Wire - not a movie but easily the best (english language) police show.
I'll second
The Wire, some good work by David Simon. Some other movies you should consider include:
Touch of Evil - Orson Wells, need I say more?
City of God - Good vs. Evil in Rio.
Once Upon a Time in America - the ~4 hr epic was Sergio Leone's last film.
The car chase trio:
Bullitt, The Seven Ups and
The French Connection.
The Big Sleep - Hawks, Faulkner, Bogart and Bacall with a complex plot.
Traffic - The excellent cast and plot earned it 4 Oscars.
Shadow of a Doubt - One of Hitchcock's favorites, for good reason
Lucky Number Slevin - nice plot twists.
Mean Streets - early De Niro and Scorsese
Frenzy - More Hitchcock
Mystic River - Eastwood is behind the camera, in this case of mistaken blame.
You should watch more older movies, most on your list are less than 15 years old.