$5000 best choice will be new Yamaha U1 or Kawai K3, the price range is up and down 5000. Pre-owned gray market piano is definately a NO GO for north american market since the piano condition not suitable for use in US region. Where is your location in US? If you can afford the price range then the Yamaha U1 is definately more like an ultimate choice within $10000 for vertical piano. Maybe I can give you some idea about the piano purchase. ^_^ Steiway even for used one will be more then 10k, Boston is basically a Kawai, so do not touch the middle line.