In my experience, Rhode Island Reds can be very aggressive, especially the roosters. Maybe Jersey Giants would be a good bet for you. Personally, I love the Easter Eggers. The variety of colors, friendliness, pretty egg colors, and all of mine are good layers. Our Delawares are nice, too, but if your birds are going to be free-range, I would choose a bird that is not white. I think the white ones might have more difficulty hiding from predators. Australorps are sweet and friendly, and prolific egg-layers, as well.