The model does matter and because of how Bluetooth is licensed, the maker pays for each little feature. So if they do remote controls, that's going to cost. Add audio and it costs.
I'd reconsider the store you shop at if they can't answer this question.
I am buying a samsung TV with bluetooth enabled, is it safe to assume that it will work with any bluetooth devices including headphone? I know that keayboad and mouse definitely work.