I ruled out all CT breeders during my search a couple of years ago for one reason or another. Not saying their bad, but not what I was looking for. So, can't really recommend any in CT. If you go up to MA, NH, there are a few. Based on my research Ryanhaus is good. I spoke with the owner and she was really nice and knowledgeable. I ultimately went a different path and am very happy with my pup. But, I would not hesitate to get a dog from Ryanhaus.
I have seen and played with a puppy from von granfenstein in CT. The owner is very happy with the puppy. She is supper confident, happy, pretty and has huge amounts of energy and drive. Depends on what you are looking for, she would be a great dog for sport training.
Good luck in your search.