@AJs:
Thus far this year, any pup I would deem desirable to me (no offense meant to anyone) has the spay/neuter required clause in the contract. What that tells me is if there is a desirable pup that I might want to show (which I believe would increase the standing of the breeder) the AKC will not consider it because the breeder required that I alter the animal, thus disqualifying it and making it obviously impossible to begin a new line from a desirable animal.
My own standards for show are extremely high due to the fact I was raised around my gramma's dogs and remember Basenji back then. My goal would be to preserve the heritage of the breed rather than tweak it here and there for a "tighter tail" or "higher neck arch" or whatever.
I'm sort of confused, and please don't be offended.
If the breeder is requiring a spay/neuter contract on the pup you are looking at, the breeder does not deem that pup one to continue on with - either it offers nothing further to the breed or maybe at that point doesn't meet the standard to the point that it may be able to be successfully shown, or maybe even a health thing.
It is good that your standards are high, but a responsible breeder's standards are usually higher than the average person buying a pup. I can say that the 2 things you mentioned (tight tail, neck arch) have never even been in the topic of discussion when I've discussed the structure of a dog with knowledgeable/responsible breeders. Top line (standing & on the move), tail set, shoulder angle - well that is a different story.
I find that the people who I consider really good breeders are quite critical of their dogs overall. It has been drummed into me before I got my pup, to not be so attached to Liyah that I can't see her faults. It doesn't hurt my feelings or change the way I feel about my pup, when people are critical of her - there is no perfect dog. One thing that was mentioned to me the other day was that inexperienced people usually comment mainly on the things they can see - colour, wrinkles, loose tail. A responsible breeder is looking at a lot more than that. I haven't even mentioned health testing and pedigree research.
The mentoring (and co-ownership) is the key thing as others have said. When I decided that I wanted to show, I would not have ended up with the pup I got had I not already been started to be mentored by my pup's breeder and had not agreed to a co-ownership. They picked the pup (although I lobbied heavily for her). I jokingly say that I only wanted her because she was related to my Ruby, but there was much more to the whole thing than that and it definitely wasn't, "I want that one", "ok, she's yours". I will say, my situation is a bit different because I'm good friends with Liyah's breeders and they know my integrity first-hand.
To me, the co-ownership has been a blessing. I've been out straight with my father's care (and Brando's broken leg during the summer), and could not put as much effort in on Aaliyah with showing. Thankfully, her breeder helped out showing her. If I had been on my own, I'm sure I would have been completely stressed out about Aaliyah on top of everything going on at home. And quite frankly, that would have been way too much.
I read that you say your grandmother would be your mentor. If her line ended 10 years ago, perhaps there are people that are still breeding (different lines) that were friendly with your grandmother (since you said she bred basenjis for 50 years, someone still in the breed must know her) - maybe they would be willing to help you find a pup to start with.