If it's not Cowher I like Gary Kubiak.
Part of 3 Superbowl winning coaching staffs including 2 as OC in Denver. He uses that zone blocking scheme that seems to churn out yards regardless of the HB- guys like Olandis Gary, Mike Anderson, Mike Bell, Ben Tate etc. have shined. He'll re-build our running game and won't insist on using the biggest linemen possible to do it.
He never had much of a quarterback in Houston yet still became the only coach to take them to the playoffs. 6-10, 8-8, 8-8, 9-7, 6-10, 10-6, 12-4, 2-11 and fired midseason.
I think he's worth giving another shot to, he has championship experience, head coaching experience and will build the O to compliment Schwartz.