I don't mind a 4-7 month old Basenji. In fact, I could tell what kind of personality they have more at that age.. It doesn't need to be 10 weeks, or 13 weeks, or whatever.
But with one that is older and needs to be rehomed, he might already have bad habits.. The only thing I didn't like about Chopper is that he was hard to train (took twp months I think to teach him to lay down on command and I couldn't teach him to roll over.) and I think he was hit a lot by his previous owner. While I loved him and he was nearly perfect, I'd like a dog that has only been with a breeder so I can train him correctly.
I was hoping some breeders might of had ones they couldn't sell. Doesn't seem the case in Florida, though.