Yes, absolutely visit breeders! Spend as much time as you can familiarizing yourself with the breed before making a decision. The idea of a Newf can sometimes become romanticized in peoples' heads and I think if everyone interested in a Newf went out there and spent some time with the reality (massive, drooling, shedding, not-always-sedate Newfs) before bringing one home, there wouldn't be nearly as many Newfs in rescue. They are amazing dogs, but not the dog for everyone. Not a dog for the faint of heart, short of time or slim of wallet!
Also, visiting breeders to gets some hands-on Newfie experience could also help you in making the decision as to what breeder you may want to go with if you decide, after all, to get yourself Newfed!