Pending UFA Defensemen from teams that are likely out of the playoffs come the Deadline
from this:
http://www.spotrac.com/nhl/free-agents/defenseman/ufa/
Guys to Target :
Dimitri Kulikov - Buffalo - Shoots Left
Michael Stone - Arizona - Shoots right
Cody Franson - Buffalo - Shoots Right
There are also a lot of depth dmen. But i would try and target one of those 3. CAn even ship out Wideman and flip that Assets for one of these guys