Who Is The Best Young Running Back?

A lot of questions are "Who is the best young QB in the league right now?". Well, I'm gonna show some love to the running backs. So the question is...Who is the best young running back in the NFL? To be considered "young", under my qualifications, this season must be the 3rd year of your NFL career or younger. So here are my candidates:

Reggie Bush, Saints
Joseph Addai, Colts
Laurence Maroney, Patriots
Adrian Peterson, Vikings
Marshawn Lynch, Bills
Maurice Jones-Drew, Jaguars
Cadillac Williams, Bucs
Ronnie Brown, Dolphins
Frank Gore, 49ers (Wow!, didn't know this is only his 3rd year and was a 3rd rounder)
Cedric Benson, Bears

As for my pick, I'll take Gore, Addai, and then Adrian. Gore showed he's one of the NFL's elite backs last year, Addai has been solid and was the only rookie for over 1000 rushing yards last year, and Peterson's been great so far and has such a high ceiling, but I have questions about his health so I'll take the safer picks.

If you think I'm missing a back who belongs, let me know!