Fancy Feast canned (ground varieties only, no slices or chunks in gravy) and Purina One dry. Haven’t had any problems.
Your Fancy Feast is great but, take it from an owner with two diabetic cats, ditch the dry food. Your Fancy Feast has everything your cat needs (it's not as good as raw but not bad either) and won't cause further illnesses like Feline Diabetes.
For anyone that's interested, here is the web site Dr. Hodgkins (the vet that testified before Durbin against the pet food companies) set up for diabetic cats. It has quite a bit of just plain nutritional info as well...
Dr. Elizabeth Hodgkins YourDiabeticCat.com
This is a great site for cat nutrition and making your own food info too...
Dr. Lisa Pierson and catnutrition.org