Hi and Welcome!
To jump right in, if when you say "puppyfinder" you mean "puppyfind.com"
https://www.puppyfind.com/
definitely stay away from that site. It may not be true that every seller on there is a broker for puppy mills, or a BYB with profit as their priority, but it's not a site a quality breeder would use. A quality breeder doesn't need to market their pups thru a commercial site like that. They may have websites, they may use Facebook, but almost never a site like that.
The reason that showing is important, whether for a family pet or a competition dog, is that the breeder is using that as a tool to prove their dogs meet the breed standard. Not every dog is show quality, they may grow a bit oversize for example, which is one of the reasons we have our pets. The same holds true for participating in obedience or agility for examples. The idea is that the breeder is not just sitting back, breeding dogs and taking payment, it's that they are investing in their dogs. Making a profit is not the goal for a quality breeder. The same goes for the health testing. The breeder is investing in not only the dog you may bring to your home. but in the breed itself.
I gave a quick look to Sunset Maple's website and it appears they've done the proper health testing on at least some of their dogs. You'd want to make sure that the parents of any puppy you get from them have documented results which the breeder makes available to you. Call that insurance that certain known genetic issues will not be something you and your pup will need to worry about. It's not a guarantee that things can't still happen, but it helps.
Very generally, 2K is within typical asking price range, and limited registration only means no breeding rights, That's also very typical. A breeder who has invested in their dogs, and the breed for the long run, want to know that their dogs won't end up being bred without the same thought and care that they've put in.
I hope you don't take my comments as criticism. My current boys are not from a quality breeder as I've described one, and so far we've been lucky. Not all of our members can say the same. As hard as it can be to wait for the right pup, you're not likely to regret the wait.