Which RBs should I start this week? ?

I am going to start 3 RBs this week. Who should I start? Who should I bench?

Ronnie Brown vs Buf
Steve Slaton vs Cin
Chris Johnson vs Ind
Willis McGahee vs Oak

Right now, I have McGahee benched. All 4 RBs have good projections. This is a standard scoring league. What are your thoughts?
Update: Rush Defense Rankings (Avg. Yds/G) Buf = 15 Cin = 27 Ind = 28 Oak = 24 *Brown is the best running back on my team. Even though he faces the toughest run defense (out of the other RBs) so I'm reluctant to Bench him. I still think McGahee needs to prove himself this year before he gets to be a consistent... show more Rush Defense Rankings (Avg. Yds/G)
Buf = 15
Cin = 27
Ind = 28
Oak = 24

*Brown is the best running back on my team. Even though he faces the toughest run defense (out of the other RBs) so I'm reluctant to Bench him. I still think McGahee needs to prove himself this year before he gets to be a consistent starter; that's why he's on the bench. What do you think?
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