I agree with Brian in that character counts far more to me than the size of their collection or volume of sales. That said, I tend to support small and mid size breeders (like me) that tend to have more invested in every individual animal they produce. Also, for me, I tend to feel that you sometimes can get better service and a better overall experience from those that do it as a side hobby and aren't so dependent on making x amount of sales a month. That is not to say there aren't big breeders out there with sterling reps and high quality, Of course there are. I, personally, just like the connection that is formed when you deal exclusively with a smaller group of people who are more likely to remember you and get in touch occasionally to inquire how things are going. In the end, it comes down to whether I find you to be honest and trustworthy (it also helps if you have smoking hot animals ha ha)
My .02
Cheers,
Kat