I'd rather not see Kane in Boston. Without going into it further than need be, I think we've had enough talented and morally-bankrupt star players signed to the B's this season.
The cap hit would be difficult- doable, I suppose, but I'm not sure it would really be worth it. I'd rather see them stick with what they've got, or at the very least plan ahead for the future with some prospects and picks- this season is sure fun, but the wet-slap in the face coming up after Bergeron/Krecji/etc. finally call it a day is going to hurt- I'd like to see them plan for that.
I keep seeing Kane rumors about Buffalo, and that makes a lot of sense as that team tries to rise up- offensive powerhouse stepping onto a team that already has some exciting talent up front, he plays for his home team, they have cap space... seems perfect.