Build a good relationship with a breeder via email, phone, facebook, twitter, Skype, or smoke signals. The method you use is unimportant, the relationship will be priceless. Let them know your plans, your budget, and your timeline. If they don't have anything in their tubs right now that suit your needs, they hatch out clutches every season. In the end, you WANT to be the guy that a breeder calls when he or she produce a smoking Pastel, or whatever it is you're looking for.
There is nothing wrong with cruzing the shows and browsing on line (I've purchased many a BP those ways), but to be honest, the high quality animal it sounds like you're looking for often times never really hits the market. They get sold right out of the egg.