What I recommend is to just get one puppy and work your hiney off raising it up. Take it to puppy socializing classes, obedience classes, and train it well in household manners. Wait until it is well trained, be it 1-2 years, and then get a puppy. The older dog will help guide and raise the next puppy and if you follow the same pattern as the first, you will have two Basenjis who are pleasant to be around and live with.
This is what I did. Duke was a just over a year old when I brought Daisy home. He was trained well enough to bring in another pup. Except, I'd say that it was easier potty training Duke than it was with Daisy. They are so close in age with the same energy level, so it works out good. Though they get VERY noisy at times. They're perfect together. I think they're both alfa dogs. Is that possible?? Neither takes any crap from the other.