Here is a thought. How about going to England and attending an auction with Dig (for instance, or have him pick one out for you). This way you can possibly get one without all the various markups (other than his fee) and get more bang for your buck.

Or, maybe even better yet, go New York, see a show, have a great meal and buy a nice Holland and Holland Second Hand from Dave Cruz at the Holland and Holland store. That way you have the actual maker standing behind your purchase. Last I checked they had a few guns in the 20 to 30 range.