Which 2 RB's should I start this week?

I take it that you aren't able to grab Hillis? He will explode against the Chiefs and is averaging 6.6 yards a carry. So, anyways, I guess you should go with Parker. Raiders, as bad as they are, have a good front line. Ravens are too tough, up front. Titans, as well. Cowboys are suspect, at times. If I have to say a 2nd RB, take Portis.