Don't know if he's unsung, but Ashley Williams has been brilliant alongside Caulker for Swansea, has shown that there is talent in the Championship that can step up to the PL.
Carrick really been playing well for United 2nd half of the season too.
Johnny Evans has been outstanding for United, played almost the whole season and has been more of a worthy player to replace Rio and Vidic. People are quick to mock him saying he's shit, but he's been brilliant this year IMO