This bike has been on CL for a while. A couple months for sure. Started out at $650? I think. I think $495 is a good deal. But you may have some bargaining room if he hasnt had any offers. All depends on the sellers situation. And in the dead of winter you may have even more bargaining power.
Its a very nice bike. I had an older version and liked it a lot. Cant go wrong with Campy NR.