It is dangerous picking your opponent – we all wanted the Jets in 2009 and we know how that turned out. With that being said, if I had to pick, my order and reasoning would be as follows:
New York Jets – If you still count them as a contender, the Jets would be my top choice. A train wreck of an organization, a QB mess and an unstable team/coaching staff.
1a) San Diego Chargers – Good QB, but poor defense, suspect running game, west coast warm weather team playing in cold weather on the Eastern timezone with a rookie coach.
1b) Miami Dolphins – No playoff experience, suspect QB, suspect coach, suspect run game, suspect receivers, warm weather team, and outside of Wake, a suspect defense.
As far as the worst matchup, that'd be the Steelers, hands down. Playing Ben Roethlisberger in the playoffs is not an ideal situation and I do not trust the Bengals against the Steelers.
Some teams just seem to have a mental edge on other teams, and despite the Bengals current 2 game win streak against the Steelers, neither win was convincing and the Steelers seem to just have that edge with the Bengals. Plus, the Steelers would mean 10,000 Steeler fans at the game.