All of this has been tremendously helpful, thank you to everyone who contributed. I've decided to change my original order with McMurray to take off the heavy rooster assortment and instead get 10 dark cornish males. I'll pick my favorite to keep, process the others whenever they get big enough, and next spring give the keeper a shot with a couple different hens (I got quite an assortment of breeds of hens too, couldn't decide). There's a barred rock, buff and white orpingtons, black giant, RIR, and a dark cornish hen that could be candidates. I also got a couple of standard cochins, just because I like the way they look. I'm hoping they can serve as incubators if the real moms don't set, since that's what cochins seem to be known for. I'll just see what happens, and if it doesn't work out, or the results are unsatisfactory, then I'll know. Or I might find that I really enjoy trying to create the "perfect" meat bird for me. I'll let you know how it all plays out!