The Valachi Papers was good.

Does nobody watch any of the older movies, like Public Enemy, Scarface (orig), Little Caesar, The Last Gangster, Angels with Dirty Faces, etc...? White Heat was good but my favorite Cagney has to be either Angels... or Shake Hands with the Devil.

Overall my favorite is Goodfellas. Once watched it at least twice a weekend for over a year straight.

Other good ones not mentioned (no particular order):

Blood In Blood Out
Superfly
Hoodlum