My favs are

The Conversation (Underrated Coppola flick. A young Harrison Ford appears in a small role.)
Night Moves (A slept on Hackman gem with a young Melanie Griffith and a young James Woods in supporting roles)
The French Connection (Just a classic)
Mississippi Burning
Under Suspicion (Another slept on one)
Unforgiven (Little Bill never dies)



But you had to play it cool, had to do it your way
Had to be a fool, had to throw it all away