Go to a couple of shows in your area and see what is on champion row. Usually there will be something like black Old English, Black Rosecomb, White Rocks, Rhode Island Reds, Black Cochins in Bantams. White Rocks, White Leghorns, Buff Opringtons in Large Fowl. Notice all of the black or white or solid colored birds in my list? Multi Color birds tend to get dinged more often for color flaws. Multi color birds can and do win shows, but it seems to be somewhat easier to get there with a solid colored bird. Anyway, when you see something on champion row that you like, talk to the breeder about getting some birds. If he/she doesn't have any available, they can usually point you to someone that does. Don't expect to pay $5 for a top quality exhibition bird. Bring your check book. All of the birds on champion row come from excellent bloodline, as do most of the others in the show. What makes the top birds stand out is conditioning. Those birds are perfectly clean, in perfect feather condition, and perfectly trained. You can take the best bird from the best bloodlines and if you don't condition it properly, you won't win a thing. All of these exhibition breeds tame down well and can make good pets. Taming them is part of the training process.
p.s. It is hard to win champion at any show. You can spend a lot of money and a lot of time to get the best bird ever and still not win. Sometimes the judge will see something that you missed. Sometimes the judge prefers females and you have a male or vice versa. Sometimes your bird will lose some tail feathers just before the show. Sometimes your bird will be tired and won't display for the judge. Sometimes you do everything right and the judge does everything right but he likes the bird next to yours just a little bit better. That's what makes it challenging and fun. If you don't win this show, there is always another.