I'm sticking with the Cowboys and for the AFC...hmmm...Steelers. I don't know why, really, cause I don't really like anyone in the AFC much. Before the year I had it Boys/Colts I believe. (I might have said Chargers though, can't remember)
Personally I don't think the Titans get there simply because against good teams, and the teams who make the playoffs will at least be good, I don't have faith in the Titans offense to score enough to continue to win the way they are.
I think Pittsburgh, who has an awfully good D as well, could beat them cause they can stop their running game, which would pretty much kill the Titans offense, and their offense is good enough to score some points on the Titans D.