Hanzal seems like a natural fit for the type of team the Habs want to build for a run right now. He'd be a great matchup center for a team that's building its chances around a stud goaltender like Price. Of course, there's always the risk he doesn't stay healthy himself...but if he does, Hanzal is the type of player who makes life miserable for the opposition and will take a physical toll on whoever he's matched up against - especially over a long playoff series.
Galchenyuk-Plekanec-Hanzal-Mitchell down the middle is solid for what a Therrien team in front of Price is going to try to do.
Demand for a player like Hanzal will be there though...he won't be available for spare change. The cost probably starts with the Habs 1st, which would be expected to be fairly late. Probably add a 2nd or 3rd tier prospect.
Actually, i'd be kind of curious if the Yotes would have any interest in Fucale as a piece. Doubt many Habs fans would lose much sleep in parting with him; the lustre is very much worn off there...
But Arizona don't have a lot coming down the pipeline in net right now, and there's always a chance they see the pedigree there and think they can pull another Dubnyk out of the hat.
Otherwise, probably a prospect that hurts a bit more for the Habs...plus the previously mentioned 1st.