It's hard to decide where you might want to get your kitten. There are many breeders with kittens available, which makes it important to consider many factors. A kitten (cat) should live 15-20-odd years, so your new family member should be a well thought-out decision. The breeder is part of that decision. The breeder you choose to purchase a kitten from should be someone you trust and whose opinion you value. Contact a few breeders and ask questions. Ask about their breeding program, the potential parents of your kitten, what the parents' personalities are like. Ask about previous kittens and what they are like now they are grown. Ask for referrals.
If problems arise once you have the kitten you still want your breeder to be available to help answer questions and share the experience of your Savannah. Ask about the breeds behind that kitten, and for a copy of its pedigree. Discuss what breeds went into making that particular kitten and what attributes those breeds may contribute to its health, looks and personality. As the Savannah breed is still in development, there are many influences to consider.