You can know what the kitten's appearance will be. Your cat will be good as a pet and as a show cat. You will have acquired a cat with a pedigree that may be traced back for generations. A purebred cat worthy of a breeding program can be registered in one of the large Cat Associations. If you've decided to get a cat, you can ask a veterinarian to give you names of reputable catteries and pet shops in your locality.
Many breeders advertise in cat related magazines and newspapers.
If you're looking for pedigree, attend a cat show and ask some owners. The humane society is a good place to get unregistered cats. Make sure whatever cat you get, the purchase is contingent upon a good health check from the veterinarian and that the cat has his inoculations. This contingency is also if the cat is gotten from a neighbor or friend. Try calling the kitten to see the response.