I have a pure bred Main Coon, and she came from a shelter. She has never been sick or had any health problems, she is 14 now. I agree with the folk here, adopt from a shelter or if you really like a particular breed, then there are specialised breed rescues. They rehome pure breeds ,but like many others already said they tend to have health problems though it differs from breed to breed just like in dogs. You really need to make your question more detailed. What are your living arrangements? Will it be an indoor cat or will it be able to go outside? Do you live in a city or are you rural? Do you want a very affectionate cat that is vocal, or prefer a more self-sufficient one? How many hours are you at home? Do you want a longhair or short hair? Do you have time to groom a long hair cat? Have you considered the cost of food, flea drops, wormer, vaccinations and holiday cover? Cats are wonderful and easy to live with.90% of the time you need to do nothing but the other 10% are important and if done well will make living with a cat a doddle.