Kevin Russo has a chance to be a super utility guy in the future, even if he doesn't makes the opening day roster, he'll be among the first call-ups. He's a way better hitter than Pena, but with less D, he can play an adequate 2B and 3B and spent some time in LF (which is a priority now), but needs to prove he can handle SS to make himself notice.
I think your roster is fine, just take out Miranda, and put either Hinske or Reed Johnson there.