It's a tough call this year. No real awesome teams in my book, not even the Titans. They probably should top the list right now, though, followed by the Giants.
I think Tampa have showed some real skill as well. Imagine what they could do with a good quarterback...
The Colts run defense is wretched. The Broncos defense (all of it) is wretched.
I don't know quite what to think of Washington yet. Right now, I'd probably put them between 3 and 5.
The Titans remind me of the 2000 Baltimore Ravens. A talented RB, a QB who can take care of the ball and not make mistakes, and a defense that can stop General Patton's tanks.