I would play Dallas Clark. Denver has given up lots of TDs to tight ends and has given up the 3rd most points to the position. I think Pitta only had one catch against PIT earlier in year, and the other options just don't have great match-ups, even Lewis. I like Clark here.
Thanks for your help.
PPR for QB, RB, WR; 1 pt. per 10 yds.; 6 pt. TD; 1 pt. per 15 return yds.
QB: Stafford, Newton
RB: Spiller, Sproles
WR: VJax, Cobb
Bench: McCoy, Mathews, Bryce Brown, Kaepernick, B. Powell, Gronkowski