It took me a second realize you asked specifically about buckeyes and my input doesn't really address that - so my apologies. But here it is anyway. I think most chickens are pretty good foragers. Sure, there are a few breeds that are less than ideal, but any active breed would probably be a safe bet. I would just try to pick a breed you think you'll like and run for it. You're going to find traits you dislike in every bird (they are kind of stupid creatures, after all), just dive in and enjoy the process! I wish you much success in your future flocking.