Well, you don't, unless you attend shows and get to know people. The rabbit world is a small place, and most breeders will not openly talk down other breeders, you have to make friends to find out who the bad apples are. Try to find the friendly ones, like Jenson suggested, those that will take the time to talk to you even though their not selling you anything are a good place to start. Just wait until they have time to talk, not when their running rabbits up to the tables. Most rabbit folks are pretty nice, but we have our jerks just like any other community.