RB for WK5 Needed and Pickins Look Slim

[ams343]

I have Forsett and Mendenhall benched for WK5 and am in need of a one play replacement. My other challenge is my DEF. I have Minnesota and picked up Seattle last week thinking the Rams would present an easy opportunity for DEF points but even with Seattle's poor performance, they got me some points. Questions are:

1. Good RB to pick up? Of what I can see, my best options are: Betts, Bell, Brandon Jacobs, or Blount?
2. I need to make room on my roster for the fil in RB and am struggling with who to drop...Mike Sims-Walker, Seattle or Minnesota DEF? Seems obvious as I type this but SEA DEF seems to get a good amount of points, even on a bad week.

Thanks in advance.