I dont know of the other breeders but I met Mark Petros at a reptile show in the chicago area. He was a very nice guy with a beautiful setup and awesome snakes. Grade A in my book. But if you can get ahold of Tom Furr in the chicago area he is usually at the reptile expo in wheaton, IL. I bought 8 snakes from him this year and they are all top of the line and beautiful. He is also a very nice guy and will make you feel good about your purchase. Hope this helps.
Good luck,
Aaron