Fantasy Help - Week 2 Playoffs - Which defense?

[CCx]

Week 2 of the playoffs, winner goes to the championship game for a chance at ~$2500 (second is ~$1700), loser goes to consolation game where there's still money to be had, just not as much.

Most of my starters are no-brainers as I've got some favorable matchups (Palmer, Gado, Jackson, Tiki) and some okay matchups (Boldin, S.Moss), but where I really need help with my defense.

The two defense I had on my squad as of Monday were Minnesota and the Ravens - last week I started the Ravens vs. Houston and they came up huge. This week the Ravens play Denver, and Minnesota plays St. Louis. So I went to the waiver wire looking to spend some cash and for some defense/special teams help.

I picked up Green Bay and Kansas City.

Green Bay plays at home vs. Detroit
Kansas City plays away at Dallas

I'm pretty sure I know who I'm going to start, but was looking for some opinions on what you all thought.

Edit: Here's the matchup for this week in case anyone cares - the Guru has me as a 2 point favorite, a little close for my liking.

My Team:
STARTERS

QB - C. Palmer
RB - T. Barber
RB - S. Jackson
RB - S. Gado
WR - A. Boldin
WR - S. Moss
TE - L.J. Smith
K - J. Elam
D - ????

RESERVES

QB - B. Roethlisberger
QB - K. Warner
WR - K. Johnson
WR - A. Lelie
WR - M. Muhammed
D - Ravens
D - Packers
D - Chiefs
D - Vikings

His team:
STARTERS

QB - D. Brees
RB - E. James
RB - T. Jones
RB - R. Brown
WR - J. Galloway
WR - M. Harrison
TE - A. Gates
K - R. Lindell
D - Eagles

RESERVES

QB - K. Collins
RB - C. Perry
RB - S. Bryson
WR - J. Porter
TE - M. Pollard
K - J. Feely
D - Jets
D - Raiders