Technically bull baiting as well. It still amazes me how these dogs at first were celebrated war heroes and popular pets in america, and now they have been villianized. Once upon a time they even graced the cover of Time magazine.
A good book goes a long way though. If you can pick it up, "Pitbulls for Dummies" is a decent read. Pits aren't for everyone, and you probably should realize that if you get one, you are looking at a lot of training. Don't get me wrong, they are 110% worth it. However, things like socialization, desensitizing, and general obedience are all very important with this breed.
I will add that even if pits were not originally bred for fighting, they are dog aggressive animals by nature. There is always a risk. But once again, here is where your level of responsibility as a dog owner can make that difference.
Good luck to you whichever way you decide.