What breed are you getting?
I'm a Pit fancier and have done a lot of research on them. Here's an interesting tidbit: A survey attempted to track the status of the pit bulls involved in fatal attacks since ~1960. In EVERY instance in which it could be verified the pit was an un-neutered male. Also of note was the presence of an in-heat female at most of these attacks.
I wish I could remember where I found that. If I can find it I'll post.