Here is some more information to consider:
I live in Pennsylvania; it is typically very cold in the winter and brutally hot and sunny in the summer. My horse farm has a lot of acreage, however, it is situated near a fairly busy road. My idea is to build a portable coop that I can easily move with the tractor. For the most part I will keep the chickens by my house and the barns, but I might also have them by the stream and woods (down the hill from my house, near the horse pastures). I want to get at least 4-5 eggs from each chicken a week, and I have no interest in using them for meat. I like a variety of colored eggs, however, that is not too important. My biggest concern is the hawks; there are a lot here. This breed would have to be alert and on the lookout all the time. I know having a rooster in the flock is a good idea, but due to the level of activity on my farm (lots of people and kids), I don't want an aggressive rooster around. That is also why it is important for the breed to be docile and kind. In addition, I have a flock of seven silkies, and I don't want them to get picked on too much either.
Thanks in advance for your help!