Probably not popular choices, but the Ravens and Steelers. Both are sort of old-school -- hard-nosed defense and team play. Both teams have some of the toughest and best players of all time (Steelers: Hines Ward, Troy Polamalu, Ravens: Ray Lewis and Ed Reed.)

Ray Lewis (if you can get past his mis-behavior early in his career) is incredible and the closest thing to a player-coach in the NFL -- he creates a standard that everyone around aspires to. It's pretty incredible to watch....