Tough choices! The Cinci DB's are solid and even though KC has the dual WR threats, Cinci should be able to hold their own. It has surprised me how well Chambers has played since going to KC, makes you wonder what SD was thinking or what happened there?
S Smith has been consistent against all comers, tough D's included and averages more receptions per game, he is only missing out on the TDs (a big component). Personally, I'd go with Smith.
For RB I'd go with S Jackson vs AZ and hope that they don't fall behind too early. Looks as though Maroney might have some carries lost to F Taylor this week?