A quick look at next year's potential roster, to get an idea of where they could add through Free Agency.
OF: Springer, Barnes, Hoes, Grossman, maybe Carter. I think it's fair to say they will want to prioritize giving ABs to all of these guys except for maybe Barnes. Krauss and Austin Wates (if he ever comes off the AAA DL) are possibilities as well.
IF: Dominguez/Villar/Altuve are presumably set, and 1B/DH will be some combination of Wallace, Carter, and Singleton. Don't see any room for a FA unless they give up on Dominguez, but why, and what FA 3B would you want anyway?
C: Castro, with Corporan and maybe Carlos Perez or Rene Garcia in the mix.
SP: Lyles and Cosart may be the only near-locks at this point, but Keuchel, Peacock, and Wojo are all strong contenders, and you've got the potential for Appel and Folty being ready to come up during the season. I guess they could add a Bedard-type FA for a veteran presence/inning eater/deadline trade bait. Can't have too much starting pitching.
RP: Cisnero and Fields will probably earn spots, and... um. Yeah, the 'pen is wide open for FA opportunities. Hopefully someone from among Lo, Zeid, Clemens etc. emerges as another decent option before 2013 is over.