Definitely speak to breeders and see if you can meet them in person (and verify the health testing that they say they do - don't take their word for it). Many breeders will refer to you others too, and I think that is a good sign. To me, it indicates that they aren't in it for the money, but rather to help you find the right match.
You can go to local shows and meet many Hav owners & breeders in person too. That's a great place to start. Several of us can help you with that. You'd just have to tell us the range of states you'd be willing to drive to see a show because some of us aren't so good with the east coast geography, especially when you can drive through 5-6 states in a couple of hours.
(That amused me when we took a trip to New York and drove up to Cape Code and counted the states as we crossed state lines over and over.)
Ask about health guarantees, too. What do they guarantee? What will they do if the puppy develops a problem? How long is the guarantee? How much money will they put back into the dog if something comes up later? Be careful with the "lifetime guarantee" phrase, because a lot of times it doesn't really mean anything when they say they will replace the puppy for you. Of course you aren't going to give up a puppy you've had for six months! By that time you've bonded.
Keep in mind that every dog is different too. I have met people that are fine with the breeder's dogs and then get a puppy that they are sensitive to. Are you allergic to dander? To saliva? Something else? It may be best to spend time with the mother of the puppy first and ask what the breeder will do if you turn out to be physically irritated by the pup.
Oh, and welcome to the forum!