Alex Boone & Andre Smith will definitely put Minnesota over this year. Love the Bruce Irvin addition to an already emerging Raider D. Jacksonville is also a team to watch out for. The additions of Malik Jackson and Tayshaun Gipson to their D, in addition to having Donte Fowler healthy this year. The Jags need to strengthen the O-line and they'll be moving up in the AFC South.
It hurts to say it, but I liked the addition of Alonso and Maxwell to the Dolphins. Both should help that defense this year, I think they will have an outside shot at a wildcard spot if they can put together a running game.
Bruce Irvin to the Raiders will have a huge impact. I think the Raiders have a good shot to make the playoffs if they have a good draft. The Patriots adding Bennett for the cheap price is also a huge get. Jags should make some bigger strides this year as well.
My favorite offseason move is the retirements of Manning, Lynch, and Megatron. Megatron because he is no longer in the division, Lynch because he was a huge part of Seattle's success the past few years, and Manning because he got to go out on top