In my opinion, 'good' blacks are very hard to come by. The off-colors in the hackles (either gold or silver) are problematic. Roosters will usually show this and finding a totally clear male will be difficult. The hens can be clear, but carry the genes for those off-colored hackles. There is also only a couple of strains in the US that carry the jet black all the way in the down too.
I may have some available this fall, but they will be pricey. I may also be able to give you the names of a couple of people with chicks for sale out of some high quality birds.
Amy.... MN State Rep for ASBC & NSBA