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Trent Richardson is an obvious pick. but there are choices beyond Richardson for your consideration.
Doug Martin, TB
I've said since before the NFL draft that Martin could be as productive as Richardson—but at a lower draft cost.
Behind a solid offensive line and surrounded by a good supporting cast, Martin is in a better situation than Richardson.
Isaiah Pead, STL
Steven Jackson, based on touches, has about another year or possibly two left in the tank.
Meanwhile, Pead, the Senior Bowl MVP, is an elusive runner who also displays the toughness to hit it up inside.
The Rams' second-round pick can contribute now as a change-of-pace back and eventually grow into the lead role once Jackson retires.
Ronnie Hillman, DEN
Willis McGahee is the starter, but head coach John Fox did use a two-back system in Carolina with DeAngelo Williams and Jonathan Stewart. So it's possible Hillman, the Broncos' third-round pick, will see some decent action this season.
It looks like Knowshon Moreno's days are numbered, and Hillman could eventually be an every-down back, considering he ran 311 times for San Diego State's pro-style offense.
The Giants' David Wilson is an intriguing running back in that he has some skills but is also quite raw. He needs to improve his vision, his route-running and his blocking, but it appears the Giants trust him to eventually pick that all up.
Ahmad Bradshaw has been injury-prone, but he's also fairly low in mileage, so if Bradshaw stays healthy, Wilson's impact will be less than the guys mentioned above—which is why I ranked Wilson lower for dynasty leagues.
Also, depending on your dynasty league's IR settings, second-year players like Mikel Leshoure or Ryan Williams may still be available.
Leshoure is a must-acquire if the value is right, as I predict he will take over the lead role from Jahvid Best before season's end.
Williams must share touches with Beanie Wells for now, but Wells' contract ends after the 2013 season, so Williams would be a longer-view acquisition.