I like Kitna for this week. Dallas has shown some weaknesses in their secondary and Detroit will be passing a ton of keep up. I think Kitna could get over 400 yards with a few TDs and INTs.
For the 2nd RB, I like Peterson. He has an easier matchup and is getting used a ton in the passing game.
Both of your defenses kinda stink this week but I'd probably go with the Giants, but only if Boldin and Fitzgerald both don't sit out.