first, welcome to the Forum.
I think it is very good that you ask questions BEFORE you get a Basenji or whatever else breed.
As you have visited a breeder already, you might have found out, that Basenjis are very vivid and full of temperament. I think it should be not a problem of having a dog, while you work from 9-5. But you maybe should think about a dog sitter or dog walker during daytime.
A Basenji is not satisfied with 30 Minute walkies twice a day and beeing left alone the rest of the day except for the evenings. Especially not a Puppy or Youngster, as far as I understood, this is what you are thinking about.
Not having a garden is not a problem unless the Basenji is able to spend time running in another safe area for example dog parcs. Would you be able to spend time with your dog doing some kind of sports? Obidience, Agility, Disc Dogging, Dog Dancing, Trickdogging or Coursing? Because this is, what a Basenji needs, he needs to have the possibility to run and think and have fun.
If you are not sure if a Basenji is the right breed for you, you should try to spend more time with the breeder you have visited before. Ask him, if you might join him/her when he goes to walk his dogs, goes to Shows or whatever he is doing with his dogs. Try to spend as many time possible with these dogs, so you might find out, that they are very demanding and it can be not so easy to get along with them.
Did you maybe think also about a older Basenji? Maybe one that needs a new home and already knows that sometimes he has to stay alone?
I am sure that if you never had a own dog before, it would not be a problem, because there might a few points where you cannot compare with other dogs and this might even be a advantage. Basenjis are very intelligent and know exactely how to get what they want. Some people call it stubborn, I would not. It is like with donkeys, they are not stupid, they are carefull due to their lifestyle.
About the prices for Basenjis from responsible breeders in the USA I cannot help you with that, I know in Europe it is common to pay about +/-1000 Euro for a Basenji puppy with FCI registered pedigrees and health tested parents.