American Staffordshire Terrier or American Staffordshire Bull Terrier? Many dogs are dual registered and shown and even titled (champion) with AKC as American Staffordshire Terrier and UKC as APBT. As far as mixing breeds, there is no telling how they may turn out. Mixed breeds can take any traits or combination of traits from the breeds involved with even litter mates ending up completely differently from each other. They don't have set genetics that lead to predictability like a pure bred you are mixing the genetics from more than one breed and widening the possibilities and can't ever be sure how things are going to turn out or how the genes are going to mix together. You might look around on petfinder and here are the breed clubs.
http://www.napbta.com/index.html http://www.napbta.com/ntlchwin.html http://www.amstaff.org/ http://www.sbtca.com/
http://www.petfinder.com/index.html
http://www.wildheirlabradorrescue.org/readingroom/what-is-a-back-yard-breeder.php
q5700674.html#a2071283
http://home.comcast.net/~NoPuppyMillsVA/Poo-dogs___Designer_Mutts/poo-dogs___designer_mutts.html
http://www.napbta.com/index.html http://www.napbta.com/ntlchwin.html http://www.amstaff.org/ http://www.sbtca.com/
http://www.petfinder.com/index.html
http://www.wildheirlabradorrescue.org/readingroom/what-is-a-back-yard-breeder.php
q5700674.html#a2071283
http://home.comcast.net/~NoPuppyMillsVA/Poo-dogs___Designer_Mutts/poo-dogs___designer_mutts.html