I have a pair of Rossi 9S World Cup ski's in 165 length. They are equipped with the Rossi 155 race binding. Din 6-15. These are the best bindings I have ever used. Retail on this set up is way up there.
In any event, they have been used for approx. two days of skiing so are in excellent shape. If you have other questions, or would like to see pictures, let me know.
Finally, I think that $400.00 is an extremely fair price and would be willing to let them go for that.
Let me know if you have any questions.