I've had issues with silkies not meshing well with the rest of the flock, thats why I mentioned it :D I know some have success but I know others have not, they also mentioned egg laying breeds and silkies are not known for laying many xD
As long as it's a chicken the breed doesn't really matter, I think the current general consensus on ratio is 1 rooster to ever 8-10 hens?
I would however avoid some of those breeds that may not mesh into the flock well like silkies : D