Not sure if you saw, but the Canadiens just handled the bestest team in the history of bestest teams. To suggest that out of the remaining teams they're the least likely to beat Chicago sort of flies in the face of the fact that they just whooped a President's Trophy winner.
Thing is, the Habs always play the Bruins really tough these days. (For reasons I can't understand, Rask is pretty much incapable of beating them at TD Garden.) And, as good as the Bruins are, the Blackhawks are the class of the league, no question.
I think the Habs are better than the Rags and would be the tougher out for the Blackhawks, sure. Realistically, though? If one of the remaining teams can knock off the reigning champs, it's the Kings or Ducks.