Which two RB's should I start: Johnson, Jackson, Williams, Benson? Help please!?!?

Ok, Chris Johnson is an automatic start week in and week out no matter what the matchup is because he is tearing up every defense in the league. It is easy just to go with Jackson as your second RB because of his reputation and recent activity, but I wouldn't go with him this week when you have two other very good options. Ricky Williams is probably your best bet just because Buffalo is a mess and Ricky Williams and the Dolphins are on a roll looking like they can put up some good numbers in Buffalo this week. I would ignore Benson this week unless you can use him as a flex option or something.