Which LB should I start for week 8? (Pick two)

Need some expert advice.

I currently have Navorro Bowman and Pat Angerer in my starting line-up.  On waivers, the following are available for pick-up:  Nick Barnett, D.J. Williams, David Hawthorne, DeAndre Levy, Paul Posluszny, or Daryl Smith

Which LB should I start for week 8? (Pick two)  Thxs!

Scoring system:

Tackles Solo - 1 pt
Assists - .5
Sack - 1.5
FF - 1

I'd start Posluszny and Barnett. However, I like Bowman and Angerer the most ROS in this specific scoring system.