I don't see who's going to challenge the Texans in the AFC South. The offense is outstanding - Ben Tate adds a great backup to Foster, and Schaub's passing is always near the league's top.
The big difference is the D, and I'm thinking we go from worst in the league to better than most.
Unless injuries decimate the team, I think the Texans have a lock on the playoffs this year, and may surprise folks by how deep they run.