The time to do a game at Yankee stadium was this year, (in the old house), not next in a new stadium that has zero history.
A game at Fenway would be a perfect venue. Between it's bandbox size, history, and old school architecture there is no better dramatic stage for next year's game. There is no doubt in my mind ,the best seat in the house would be one from the monster seats.
As far as a opponent. Bruins fans could care less about the Rangers. They want Montreal. While Boston hates New York and vice versa, the true hockey rival of Boston, throughout their entire history, is Montreal.
After two years of four American teams in this "classic" series, the true home of hockey deserves a representative next year. There is no better fit than the Canadians.