Buff Orpingtons are one of my favorite breeds, they are pretty easy going, not prone to hysteria, most are decent layers, about 3-4 eggs a week, but they lay for many years. I enjoy barred rocks as well, some can have an attitude, others are friendly, Australorps also a good breed, RIR, kinda the same as the barred rock.
Silkies, I wouldn't keep with the other breeds, they can't see well, they need a bit more protection from the elements, they are prone to having their crests pecked, some are hatched a bit off and slow, I would personally keep them in their own coop, but one advantage is you have a perfect incubator for hatching eggs.