There are plenty of good breeders of both. I here they are good mothers. My other breed I depend on for eggs, so the incubator will be full, except for maybe the end of the season. If you have ANY information about Sebrights, Turkens, Seramas, or Sumatras, I would be very grateful for your help. They are excellent broody mothers.
Silkies come in white and black and other colors.
But if your raising them for fun no need to worry about it. Sumatra's would be a good bet of the breeds you mentioned for broodiness also. My large ones are very good sitters and mothers. I have never raised sebrights so not for sure on them. Hope this answers something for you.