RB/WR Flex options

Here are my RBs and WRs:

R. Brown MIA (@ CHI)
W. Lundy HOU (@ NYG)
L. Washington NYJ (BYE)

R. Wayne IND (@ NE)
H. Ward (vs DEN)
M. Colston (@ TB)
B. Berrian (vs MIA)

My league is mainly a scoring league, in that RBs and WRs have to get 80 yards before getting any yardage points.. But TDs count 6 pts as usual..

We can only carry 3 RBs and 3 WRs, but can add someone to the IR and carry an extra player (why I have 4 WRs).. Ward is on the IR for me, but I can switch him out if necessary..

I know I need to improve my RBs, but there's not much available other than Brandon Jacobs, who is really tempting right now, especially since they're playing the Texans.. But he's a situational player, which worries me.. It's boom or bust with him..

All that being said, what combination of RBs and WRs should I play this week?