Before the Labrador retriever came to dominate the scene, the American Pit Bull Terrier/American Stafordshire Terrier was the most popular dog in the United States. It's such a shame that they get such a bad rap.
If you like that type of dog, you really should consider getting an American Bulldog. They are in the same general family but a lot gentler (unless you decide to get a male and not neuter him) and more even tempered. There's half a size bigger too - which may or may not be a deal breaker.
Don't get one from a pet store though - go to a reputable breeder. My wife and I got one that we fell in love with at the pet store when just stopping in for date night. One year later the dog died from some form of genetic kidney cancer. Neither of us ever cried so much in our lives. A good breeder with good blood lines will help avoid such emotionally traumatic experiences.