Harden is a top 5 player in the league. He would instantly be Boston's best player for at least the next couple of seasons. Of course Ainge is interested. Heck, he tried to get Harden instead of Jeff Green years ago. The only question is, does Ainge want to pay the price it will take for Houston to move Harden to Boston. That is the only thing yet to be decided. That I have no idea on, but Ainge is absolutely interested in Harden because Ainge is interested in every great player.