Here are some breeders, I'll give my thoughts on them.
Sienna Basenjis
I like that they do conformation and lure coursing (maybe even more, I'm not the best at title abbreviations). they also screen for common genetic problems and tell the truth about them. What does worry me is that nearly all of their dogs are carriers for Fanconi. That in itself is not a huge problem, what you need to look at is who she breeds with who. Fanconi is recessive so no pups will have symptoms of Fanconi unless one or both parents had Fanconi (were "affected") or both parents carried (are "carriers") the disease. So if she is careful to only breed her carriers with Fanconi clear dogs everything is fine. If she breeds two carriers or a dog affected by it I would avoid her. She did neuter her one fanconi affected dog so that's good, she also neutered a dog too large for the breed, another good sign that she is trying to make predictable (so puppy buyers know what they are getting, if you want a Basenji you want a dog that looks and acts like a Basenji is supposed to) and healthy pups and is not just in it for money.
I'm not sure when the site was last updated though.
Website does not have a ton of info on the environment/raising of the pups, you'd have to ask about that.
Sherwood Basenjis
Love that they lure course, show (though not much in the way of show titles, most have lure coursing titles and for me that's just as good) and most dogs have Canine Good Citizen awards. They screen their dogs for common genetic problems including Fanconi. My only problems with them was breeding Bindi before she had titles and having multiple litters at once (although the litters were VERY small, I'm not sure if that's normally what happens with that breed and she knew they would be so tiny).
Those are the ones I've liked so far but I'll look some more.