I might ask what you are using it for. If you just want to play solo or quietly(if that's possible) in your own home, I would go with the Bb as Jeri said and brass. If you are looking to play mostly in sessions, I would go with the nickel in D. Personally, I find slow airs way too underplayed in sessions. That's why I am saving up for an Olwell flute. Of course, I ordered the one with the big holes and bore to be heard in sessions.