Whatever breed I selected, if I were going to go with one dual purpose breed, I'd spend the extra money to obtain good quality birds from a breeder, for the reasons Greyfields mentioned. You might get lucky with hatchery birds, but not often. That's why DP's have such a bad rep, IMHO, is because the hatchery birds are such poor examples of the various breeds. Good quality Barred Rocks, Delawares, Dominiques, and many others are perfectly good meat birds, and good layers as well. They aren't the huge breasted Cornish X's, but they're big enough. We ate them all the time when I was a kid, and they were great. We had fried chicken every week. One chicken fed a family of five. It wasn't tough or stringy. You just have to butcher them young enough, before they get tough. And of course, older birds stew up just fine.