Hi Jolanda, and welcome!
Sorry to hear about Simba's passing, but I CAN tell you that once you have a basenji in your life you will never have a dull moment - lots of joy, fun, training and sleeping with a warm buddy right up next to you - that is, if you will let the basenji in your bed at night. Lots of us do. Then there is the puppy proofing the house and especially making sure that things on your counters are about 18 inches back.
I'm glad to hear that all the harping everyone does on here about getting a pup from a breeder who does the correct health testing and whom is reputable has passed off to you. Hopefully the breeders near you do all the necessary and correct testing or will at least start NOW before you consider a puppy from her. How did it happen that the breeder of the westies wound up having a litter of basenjis? Can you find out where those pups are now and how they are doing? I would think a reputable breeder would be more than happy to share this information.
Again, great having you here. Read and research lots and lots. July will be right around the corner. But be prepared for the week before you bring your basenji home to be a torturous one!