I'm here lol,
I can understand your fear and I'm sure I would be feeling the same way,after encountering an attack of this nature.

I would advise you to visit a dog show near to where you live and see the breed in the ring,talk to breeders and meet their dogs.Staffords are fantastic family dogs and very very rarely do they attack people.I have a dog aggressive bitch,she hates some dogs with a passion,that is why she is never allowed off lead.Unfortunatly you will always get one idiot that lets a breed down.