As a hunting dog owner and lover, and a DU member and former chapter committee member who helped put on more than one banquet I'd like to make a suggestion that may help you in getting a better quality dog for your banquet. Guarantee the breader that you will screen potential bidders and not let their dog go home with some guy who is too drunk to think clearly and will regret the decision the next day. Or better yet, tell the breeder they will have the final say on if the winning bidder does indeed get the dog.
I'm not saying this situation is the norm at banquets, but I've seen it twice. On one occasion the buyer actually inquired about returning the puppy less than a week after they bought it. When I was on the committee we always had trouble getting a puppy from the higher end breeding stock, and the reason was always the same. Good breeders screen their buyers thoroughly because they care for their animals, and many will not trade a puppy to a poor home in exchange for some marketing.
DU is a GREAT organization, and like I said I'm a member and have helped put on banquets in the past. But this is one small area that I would like to see banquets improve.
Best of luck in your search and in putting on a great banquet.