Thirteen Days looks interesting. Some others worth mentioning.

Election
1999/Payne
For some reason it seems to be completely written off as a high school comedy for brain-dead teenagers, which it's not at all. Consider the fact that the main character is a 40 year old man going through a mid-life crisis. Just because Reese Witherspoon was in all the advertising as the geeky school girl, doesn't mean everyone has to overlook Alexander Payne's fantastic direction and the biting humor peppered throughout the piece. For anyone who enjoyed his later work, give Election a rewatch, you might be surprised.

Casino
1995/Scorsese
Unfairly written off as a Goodfellas rehash. A true masterpiece in its own right.

The Truman Show
1998/Weir
The fact that it was Jim Carrey gave people the wrong impression. One of favorites for a very long time.

The Man Who Wasn't There
2001/Coen
Why do I not even remember this movie coming out? Bad marketing and critic's expectations for Fargo-like humor resulted in an undeserved bashing in some cases. One of the best of the last decade.

Carlito's Way
1993/De Palma
No it's not Scarface Pt II. Get over it. De Palma can actually direct, and Pacino doesn't have to shout all the time.

Thief
1981/Mann
Don't let the badly dated clothes and technology fool you, this is a great movie.

The Godfather Pt III
1990/Coppola
Suspend your love of the original two for 10 seconds and enjoy this movie in its own right. The only thing worthwhile to come out of Francis Ford in the past 27 years.