Unless they've changed their policy, I believe Vinshine includes shipping to the U.S.
If the difference between new and used is truly only $250, it's a no-brainer: Buy brand new from Vinshine and get the latest version, factory packaging, fully factory warranty, etc.
However, what used DACs are listed for and what they actually sell for may be two different things. I love my Pontus II, but I'm not sure I could get $1600 for it.
My 0.02.
Terry