I'd still go with Moreno. I would think Chicago will have a double-digit lead in the second half limiting rushing for Detroit if Smith plays a lot anyway.
I have Moreno and Choice as well. I think I am starting Choice over Moreno.
From rotoworld:
According to a source cited by ESPN.com's Matt Mosley, Tashard Choice will get "the majority of work" for the Cowboys Sunday, even though Marion Barber (quad) is probable. Barber made the trip to Denver and will probably be active, but it's unclear how healthy he is. The Cowboys signed Chauncey Washington off their practice squad yesterday to protect themselves. Barber is turning into a very risky start against the Broncos.