I recall GW was quoted before as saying he wouldn't take a job unless the QB was established and in place. That would make Houston and Denver viable destinations. The Bengals could be argued in the equation there. I remember him also saying that he wouldn't take a job where the chances for pretty quick results are slim. Why should he, he is in a great, well paid job where he is given a lot of freedom and already has a ring from it.
In fact, in searching for that quote, I found this two page thread on GW as a head coach on the Denver boards from after yesterday's game
http://forums.denverbroncos.com/showthread.php?p=3607127