Upload & Sell: Off
I bought one used (DG version, non-OS) a few months ago for 1500$. The lens was in very good condition with no paint chip and almost no mark or scratch. It came with a B+W UV filter.
Before pulling the trigger, I did a lot of research and all the DG, non OS versions I came across where between 1250$ and 1600$. The lowest price was for a lens with a lot of mileage (paint chip,...) and even a small scratch on the front element.