I don't think I will breed... If I do, I'll be keeping all of the pups for myself, or possibly giving them to someone I trust to work them hard and take good care of them. I can see myself possibly breeding a litter of APBTs some time in the far, far future.
ETA: It's hard to find Bull Lurchers in my area and I'm of the opinion that they are the absolute best dogs for hunting coyotes. If I were to be in possession of an APBT who had proven to be a good hunting dog, I wouldn't be opposed to crossing it to a (likewise proven) sighthound, but again, I'd want all of the pups with the exception of the other owner's picks. That way I could see for myself which pups made the cut as adults, and spay/neuter those that did not and find them homes.