Broncos
Steelers--period
The New York Jets had the best last year, though the best defense in the league statistically shifts every season.
For the 2009-2010 season it was the Pittsburgh Steelers in terms of points, and the the San Diego Chargers in terms of yards allowed.
Brian Urlacher
probably the steelers.
Steelers and Ravens
Marseille is the French league club that holds the record for the best defense in a season having conceded 21 goals in the 1991/1992 season.
the Tennessee titans had a record of 13-3 the best that season
Peyton manning cause he has no run game or defense
ravens
Aaron Rodgers