How do you choose a good bird breeder?

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We currently have 2 blue masked love birds and are looking to buy another bird. We are either going to get a Quaker (probably a blue one) or a Lineolated Parakeet. Due to the fact that there are no breeders within reasonable driving distance , I am going to have to choose a place by calling and then driving to pick up the bird (I am not shipping a bird). Have you ever bought a bird from a breeder? If so, what questions do you ask? I am going to ask about the following: vaccinations, DNA sexing, any disease out breaks, how/when the birds are weaned.