I'm surprised at all the support for using a #1 at the RB position. Haven't we learned, over and over again, that RB's have a relatively short shelf life and can be found later in the draft?
Here's a list of the RB's taken in round 1 over the last several years. You decide how many were worth it. Some great players to be sure, but also plenty of cautionary tales. And note that both of this past Super Bowl's teams didn't have 1st round RBs.
Now think of the current guys who weren't taken in the 1st