I empathize with you, I lost him as well.
In your situation I would go with
Coleman for sure. We know his usage and the game against GreenBay should be high scoring and lots of options for Coleman.
As for the other two... we don't really know their usage yet because week 1 didn't show us enough.
Mixon - He is more talented then Allen, but he is up against a tougher D in Houston. And Cincy has 3 backs that could get into the game depedning on game flow.
Allen - Less talented, I think he will be the passing down back and Cleveland is not as good as Houston.
I think I would try Allen for two main reasons:
1) Only competing against 1 other RB more majority of snaps (West)
2) Cleveland is not as good of D.