Along the lines of Lovie Smith, if there is Cowboys interest in DCs who occasionally been crappy Head Coaches, good chance Dom Capers is available at the end of the season as well.
Chicago's defense worked last year, and is decent this year as well.
The defense just doesn't have very good players, but I think bringing in Lovie, and maybe even keeping Rod as the DC, with a smart offensive guy is the right move. Not sure who that guy would be, but the lack of creativity on offense is just absolutely frightening.