Personally, I've never met an ill-mannered pit bull. But I'm sure there are some out there. In one study done on aggressive tendencies (to try to bite strangers), the top worst breeds were: 1) dachshunds 2)chihuahuas and 3)jack russells. They said 20-25% of the dachshunds observed tried to bite a stranger. Of course, that means that 75-80% don't.
On the other end of the spectrum were labs, retrievers, and rotties. Of course, rotties are big and dangerous-looking, so they are right up there for having themselves banned. A good resource for dealing with aggressive tendencies in individual dogs is the yahoogroup "agbeh" (for aggressive behaviors in dogs). It's a good place to lurk: lots of dog trainers on that group.
On another subject brought up by the OP, "exotic" animals: some people say that any animal domesticated for more than four generations is no longer wild. Lots could be said here, but I think it's about time to get domesticated skunks off that list. Of course, they want to scare everyone into thinking that skunks just get born with rabies, which is ridiculous. It's like saying native americans are born with alcoholism. I "rescued" an albino skunk from a local pet store and got her to a good home in one of the states where it's legal to have a pet skunk. She was a very sweet girl, once she got used to not living in a fish tank and eating cat food kibble (at the pet store).