Waiver wire qb and rb suggestions

Week 12 decisions.. I would like to pick up Case Keenum and bench Philip Rivers.. Both of my starting rb's have a byew week Lynch and McCoy, ive got Zac Stacey, Moreno, and ellington.. usually ill switch moreno and stacey as my flex.. the waiver wire in my league is stacked with could be tallent. What are your thoughts?

Pick Keenum if he's still available. I think SD will pull out the win, however, might be a low scoring game.

Don't bench Rivers. He's been a top 5 QB all year. This could be a double trap game for KC so they may come out flat. 

I thought about that.. I'm looking for a risk that will pay off though and i don't see rivers as a big pay off, i pulled two qbs of the waiver went with Eli and Case i hate the giants and cowboys equally but i think ny will have a big/good game.. Its that time of the season where the giants go ape garbage,  and they are also at home.. Dallas cant seem to stop the run either so i pulled Andre Brown in off the wire as well for my flex. Sadly its been a tricky pick between Case and Eli..