I'd love to see Jonathan Toews on the Habs, and see him become the captain (again) after Gionta leaves. Apparently he's still good friends with Price from their WJC days, and the guy even speaks fluent French (his mother is Quebecoise).
A defensively-responsible, potential PPG #1 centre who delivers in the playoffs, and of course: the intangibles. I believe he is just the type of leader the Canadiens organization has always valued (Gainey, Carbonneau, Muller, Koivu). Can't go wrong with Toews.
Haha, even if the Sens added another awesome centre they'd have pretty much no one on the wings for Spezza/other guy to play with and their D would still be questionable unless Gonchar/Phillips/Kuba turn it around.
So pre-concussion Crosby would probably be the only guy who could make us really respectable because he doesn't seem to need a lot to work with. But we still wouldn't be real contenders.