Bruce, Marc's suggestions are quite good although I very much doubt that you will find another complete H.P. rig. Simpson Ltd has one of these H.P. Lugers with a single matching magazine for $2250 (
http://www.simpsonltd.com/product_in...88dfac46f96ba1). Prices from retail sellers are good for insurance purposes but are higher than you would likely realize if selling. On the other hand, you appear to have a complete matching rig which should go for much more than the Simpson gun.
I suggest that you post more photos and more information about the rig for two reasons. One, you should get more accurate value information from forum members and, two, I and others would love to see more. Additional photos that would be helpful include the top of the gun, close-ups of the left and right sides of the receiver (where the crown/N proof and second unit mark are), the front of frame with serial number, the stock lug area, the bases and spines of the magazine(s), the front grip strap marking and the back of the holster with the maker's mark.