Tina's right. The most important thing to remember when looking for a well-bred pup from a great breeder of ANY breed is that these things are well-planned in every way. That means that a good breeder will spend long periods of time looking for a great mating, one that produces healthy dogs with no genetic problems and generally furthers the greatness of the breed.
Part of that process means finding awesome owners for the pups that aren't necessarily going to be show or breeding dogs. That takes a long time and a real investment on the part of the breeder.
You would be a smart Newf-to-be owner if you spent the same amount of time researching the breeder and the breed. I've been researching my new Newf for a few years now, and still haven't made the commitment. I'm still trying to understad genetics a little bit. Just enough to know what I'm looking at when I see a pedigree. I don't want the wool pulled over my eyes.
This is a great place to ask specific questions about those types of issues. Being armed with information will help you discern a good breeder from a not-so-good breeder! So, ask, ask, ask! We're all here to help!