Who are they all they playing against? Without that info, its tough. But, without looking at schedules, my breakdown is like this.
QB: Brad Johnson - He is a pocket QB on a team with a fairly strong o-line and incredible receivers. He can throw to TO, Witten, Crayton, and now they have signed Roy f-ing Williams... its a no-brainer if you ask me. Johnson will pass for 250yds and at least 1 TD.
RB: Joseph Addai is out 2-4 weeks with a torn hamstring, so thats an automatic no. I dont think Peterson will have a good game against a strong Bears defense, but look at his stats from this same situation last year and you may disagree. That leaves Brown and Johnson... Thats my .02
The only questionable call is AP. He could explode like last year against the Bears, or be mediocre like he has been nearly every week so far. I think it would come down to the match-ups.