There are a lot of people who will tell you that AKC registration is a scam and doesn't mean anything, do some reading and make that decision on your own.
What I will say is that just because someone's dogs are not AKC registered doesn't mean they're a bad breeder. People look at bloodlines and registration as a "guarantee" that you're getting a quality dog from a lineage of quality dogs. AKC Registered and Champion pups tend to cost more because the bloodlines are "proven" which really just means that you have a high statistical probability of getting a Vizsla that looks and acts like a Vizsla should, according to the breed standards. Everyone knows there's no such thing as a guarantee. And the reality is that in order to be AKC registered you just need to fill out the paperwork and submit for registration.
My advice is to do your homework, if you're just looking for a housepet, not a hunting companion, or a show dog, and you think you've found a reputable breeder then you probably have. However, don't trust a website. Talk to a local vet, talk to past puppy owners, ask if he/she is involved with the local Vizsla club, etc. If you spend a little extra time and effort will go a long way.
What I will say is that just because someone's dogs are not AKC registered doesn't mean they're a bad breeder. People look at bloodlines and registration as a "guarantee" that you're getting a quality dog from a lineage of quality dogs. AKC Registered and Champion pups tend to cost more because the bloodlines are "proven" which really just means that you have a high statistical probability of getting a Vizsla that looks and acts like a Vizsla should, according to the breed standards. Everyone knows there's no such thing as a guarantee. And the reality is that in order to be AKC registered you just need to fill out the paperwork and submit for registration.
My advice is to do your homework, if you're just looking for a housepet, not a hunting companion, or a show dog, and you think you've found a reputable breeder then you probably have. However, don't trust a website. Talk to a local vet, talk to past puppy owners, ask if he/she is involved with the local Vizsla club, etc. If you spend a little extra time and effort will go a long way.