I agree that there are MANY different opinions on show breeders. It also depends on what you want for color and how much you have to spend. I have experience with only one top breeder who specializes in blue merles - Guy and Thelma Mauldin, Kismet Kennels (Houston area). I believe he is or has been the top US breeder for multiple years.
I am now retired and live in Singapore so have not seen Guy for many years but do correspond with him from time to time.
Good Luck,
Dan