You are almost always better off selling extra magazines and accesories seperate.
There is a mint P2000 V2 9mm at a gun shop about 5 minutes from my house for $699. The owner said I could have it for $650. I have bought several magazines for my P2000 .40 that looked new for about $30 each.
Unless you just come across someone that "has to have it", I would say in the $750 range.