Regardless of who the coach is, the OC and DC are key positions to fill with quality coaches.
Offense - how about something other than off tackle run, off tackle run, QB draw, punt. How about a coach that can do something that hasn't been done in 12 years - perfect the screen pass and throw to the running back in the flat? Use the tight end consistently. We lost games to teams that just throw to the TE a lot. Oh, and how about an OL blocking scheme that works?
Defense - more stunts, more blitzes and cover 2 for the D backs. I always dominate NCAA football with cover 2 D.