Everybody has their own opinion and preferences, and I think a good breeder is in the eye of the beholder. Titles and conformation means absolutely nothing to me when it comes to working dogs. Ma'ii is supposedly purebred, according to his old owner and pretty much every ACD savvy individual we've met, but I'd say there's a pretty slim chance he'd ever win in a show ring....unless, you know, the judge was blind, lol. However, as far as his drive, work ethic, and being able to get a job done? This dog spent 6 years of his life, driving stock up on a ranch in NY, and according to his previous owner, was GREAT at it. There were a few reasons as to why his previous owner was rehoming him, none that were by any means the dog's fault, but what it essentially came down to was a lifestyle change....and a new girlfriend that didn't like dogs.... But that's okay. My only regret is he never took any videos for me to watch! Yes, we've had some behavior issues from him, but I attribute that more to a life time of having very little training then to bad breeding. Because most of those issues have been trained out of him.
My only want in buying a dog from a breeder would be health and temperament tested, but that's it. I couldn't give a flying whoop about titles.