Hello Mike: As I am sure you will hear from other members, one can get some idea about the value by checking on that infamous auction site. Search the completed auctions to see what the camera outfit has actually sold at. Another way might be to check the price of the outfit "new" at one of the reliable camera stores that are mentioned often ( for ex&le, B&H ), and several of the better known and respected stores that deal with "used" items ( for ex&le, Photo Village, K&S, Kurland Camera, KB Camera, and so many others ). Remember of course, that the "used" dealers will buy the item for 60-80% less then what they sell it for so obviously the value when you sell the gear would be less then the listed selling price. Some of the owners, ( Rich at The Village, Rick at K&B, Eli at Kurland Camera, etc. ) will actually talk with you an give you honest and good advice as to value. Finally, the Leica Historical Society has a very active "for sale" brouchure that you will recieve when you join. You might gain a good idea of the value of your gear that way.
Let us know how things work out.
Elliot