I find the placement of both Miami and Washington on your list as interesting. I think both are in for a nice season, maybe Washington finishing off better than my Dolphins.
The Dolphins haven't had a losing season since 1988, when they went 6-10. They have been a team of consistent regular season excellence for more than a decade now. What other team can say that? With the addition of a stud running back, addtional depth to the O-Line, a super solid defense, and a bonified superstar in the making with Chris Chambers, I think they're the team to beat in the AFC east.
Washington is starting to find out what the Fun n' Gun is all about. Even with crappy quarterbacks, they still drop bombs all over the field. Their defense may very well be the best in the league this year. Marvin Lewis is amazing, and the cast that he has there (Arrington, Baily, Armstead, Trotter, Smoot, Green, Smith, etc.) are second to none. I find that with a powerful offense and defense, many a game are won.
Oakland may very well have a difficult time without John Gruden around. Bill Callihan just isn't the force (emotionally or spiritually) that Gruden was. He embodied the Raiders spirit.