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I highly recommend you go to the chicken show in Lebanon, Indiana in Oct. or find out if there is a large KY show in October closer to you.
http://www.poultryshowcentral.com/Kentucky.html
You can get a close up, almost hands on feel for the various breeds you have chosen. Right now you might need multiple coops if you stick with all of the pictured breeds. Silkies tend to prefer small but sumatras like space and height. Brahma's and wyndottes are on the larger side. Sumatra can be on the large side or on the bantam size. I'm not saying it can't be done but there is something about seeing a chicken up close that is better than the picture.
The best part about the shows is the list. I did not know about the list the first time I went to a show but now I know. Somewhere near a sign in area, there is typically a table that has a list of the chicken owner and the chickens they brought along with an address to contact the breeder.
Sometimes the show organizer will just know who is the most likely to have the best in a specific breed. Down South there used to be a breeder ~ Bob ~ he had great Banty RIR. He was well known.
Then there are breed threads on here and most posters will help you get in contact with a semi local breeder.
It sounds like you have a lot off roosters already. If you are still looking for a sumatra, I should have a couple of roosters available by the Lebanon show. they would be under a year old but close to mating age. They would be able to crow. They would not be quite as dark as the picture but they would be close the sumatra hen I might have a pair of those but they sure don't look anything like the roosters. They do tend to go broody and you already have silkies listed.
Brad and a few others on here raise silkies.