I'm a sucker for a Cinderella story so I'm going with the Saints. Also, I have to root for my own conference; however, it would be much better if the Eagles were playing. Maybe the Eagles versus the Steelers. That would be great! Then we can combine both teams into one superteam and go to each city, kicking the asses of every other NFL team until there are none left. And then we'll do it all over again next year.
Go Saints!