If you are looking for a used luger you probably want to stay right here. Most of the Lugers in the gun boards seem inflated in price. In the spring I bought a shooter from someone on this website for under $700.
Put a request in the want to buy section of this website and see what happens. You probably want to keep your eye on the Lugers for sale section also.
Edward Tinker has a good looking luger for sale right now for $1000 in this thread.
http://forum.lugerforum.com/showthre...threadid=16124
Chris