I don't know how well know Mike Sauer is, but I wouldnt be suprised if he played in the NHL next season. Could become a exceptional stay at home D.
Lauri Korpikoski could suprise some people. He needs to take another big step, getting a bit faster and a bit more explosive; but he got a really high skillevel overall, and a tremendous workethic.
A supersleeper could be Corey Potter. He is pretty "sexy" for a low key, late round pick, D. Very good lateral movement, solid size, good positioning and ok hands. Age is speaking against him, he will probably need 2 more years in the AHL, and it gets allot harder to get chances as a rookie at the age of 25-26 then if you are 22-23, and it also seems harder to stay positive and work hard at that age. But he could become a solid NHL D, like a Aaron Miller copy.