What hole in Montreal are you looking to fill?
There are other players available, but right now, we aren't looking for a Dman and no centres except for a top 6 centre and even that we don't really need...Nelson is close...more like a 2b/2c top 6 centre.
My thinking is that we need more size up front for the playoff run to compete with bigger teams. Clutterbuck is big, physical, experienced and strong defensively and is not a black hole offensively either. Value-wise, based on past precedent, NYI could get a 2nd for him at the deadline. So for the playoffs Clutterbuck >>> Desharnais.
Beaulieu is 3 years younger than Hickey and cheaper (for now), but Hickey is the better defenseman right now. Slightly quicker, much better passer, more consistent in his own end, although less physical. He's been playing ~18-19mins/game for a few years now and could compliment Weber (or anyone on our right side). One for one it's probably an even trade.
Desharnais is only for cap reasons, so his value in the trade would be pretty much neutral if NYI is out.
So the Habs could likely get away with offering a 2nd instead of a 1st.