I've heard a lot of good things about the broodiness of buff orps, cochins, japanese bantams, and Old English Games. I can't tell you for sure on any of them, since mine aren't old enough to lay or brood yet, but I did get some BO's and cochins for that purpose. I guess I'll just have to wait and see, but I've heard those breeds are excellent setters!!!
For broody hens. I've heard of Silkies. Orps and a few others i cant think of. But. if you want a real good broody hen. And a hen that can protect the biddies well (if you dont take them away) You cant go wrong with Old english game bantams (their a bit small to run something off though. And can only hatch about. 10 eggs maybe). But you cant go wrong with american games. (the large fowl), Only problem is most of the hens. Are not to be messed with when they have biddies. their real protective. (i raise gamefowl. Or used to now just OEGB's.)