My top five....
1. Health/Temperament - I want a breeder that health tests, as much as they can, even if they have a pretty good idea that their dogs will pass. I want a breeder who produces correct temperaments for the breed.
2. Not a Ribbon Hunter - I don't want a breeder that compromises on structure (or temperament, or anything else) because *incorrect* is what's bringing home the big ribbons at the time. Dont' get me wrong - titles and big wins are awesome - but to me it's only awesome if it's done with a
correct dog.
3. Communication - I've come to realize that I need a breeder I can get along with, and is BIG on communication. A breeder should be supportive for his/her puppy buyers.
4. Breed Knowledge and Vision - I want a breeder who knows the breed (and his/her own lines) inside and out. I want a breeder who has goals, and has a plan for reaching those goals.
5. Embraces Versatility - Kind of self explanatory. I want a breeder who can provide me with a dog that can do just about anything.
There is more that I'm probably missing, but that's what comes to mind.