I think all the best sleepers have been covered.
Utley, Chris Burke, and Hairston are definitely the top 3.
Other than them, I can only see Brandon Phillips as a potentially good 2B. He's made big strides in his K/BB ratio this season, next season he'll have to prove it's no fluke.
Cuddyer is also interesting, as someone else mentioned. His status is still questionable. He could replace Rivas at 2B, Koskie at 3B, get traded elsewhere, or be stuck in a logjam as he has for the past couple of seasons.