I think that something that outlines the typical process so that buyers are aware of how things work with responsible reputable breeders would be helpful. I know that I bought my first basenji in the early 80's without much screening information. I didn't know what to look for and paid the price for that. Maybe some sort of statement on each option like:
Puppy - typically basenji breedres maintain a list of interested people. This is so that they are certain that the puppies they produce will have good homes waiting for them. Blank slate - that you can mess up if you are not firm and consistant.
Breeder Return - sometimes a breeder gets a puppy back for a variety of reasons like job transfer, change in living arrangements, military service etc. Still a youngish dog - screened by breeder so you will know if there are any issues.
Retired Show dog - a dog that has been shown to it's Championship or a dog who was kept for showing and didn't like it or did not grow up to be quite what the breeder expected. You get an animal used to traveling, arround people, pretty decently socialized, walks on a lead.
Young Adult- What you see is what you get - how they are is likely a good reflection of their personality especially good to determine if kids and dog work.
Rescue - can be a gem in the rough - may not have full histroy but typically committed basenji folks will be there to help you if the dog came through one of the networks.
Pet stores - you get no support from a breeder, likely came from a puppy mill, vet check doesn't mean that the puppy was screened for the likely things that might crop up in any dog or specifically in basenjis. If you buy from a pet store - you essentially support puppy mills - you may 'save' this one but you will send a message that hey these dogs sell and more will be there the next week.
Anyway something like that - might be useful to have as a readable document. Feel free to tweak, edit or dump.