Can y'all help me with my QB situation

We play a two week semifinal. My team (highest average during the regular season) took a big steamy dump all over me last week.

I'm hanging in this week (despite starting David Wilson over Trent Richardson).

I have four QB's that I can play this afternoon:

Rivers v. Car
Palmer @ KC
Romo v. Pit
Kaepernick @ NE

Which would you start? Who's most likely to shite the bed completely?

I should be in good enough shape if I can get 250 and 2 TDs.

Right now, I have Palmer in, but I'm leaning on switching over to Kaepernick against the Pats terrible pass defense.

Thoughts?