ESPN financial sports analyst Darren Rovell recently reported the top 5 most valued NFL franchise;
http://www.espn.com/nfl/story/_/id/20745330/dallas-cowboys-worth-48-billion-almost-twice-much-average
Cowboys, $4.8B
Pats, $3.7B
Giants, $3.3B
Redskins, $3.1B
49ers, $3.05B