When it comes to Dorkings they are very rare and in Grays they are kind of stuck. If you get some from this person or that person who has them they are about the same. Just kind of average. In Whites Joseph has some very nice ones in the New England area and would make a good breed in my book. Dont know much about Chantecler, never seen one befor. As for Black Javas there are many who have them. Type into your search en-gin Black Javas or the Java Club. There are a few who are really making big strides in this breed. In five years I think some will make it to champion row.
Could I ask how you choose these three breeds? I often wonder how people come up with breeds they ask about. It may be nice for us to learn from folks wanting to get into Standard Breed Old Fashion breeds and leaving the feed store breeds which they started with. Was it the storys or history or the pictures you see?
Also, go to the new thread they have brought up Javas as the breed of the week. They just finished Dominique fowl.
If you want more information on top breeders I can send you a few names of folks I may know who has them. Big problem is getting started as top breeders normally don't send eggs by mail or even chicks. You most of the time have to get them from their customers who bought birds from them.