I have to agree with Gary. I do not think you are dog people!
Any breed can turn nasty or be trained that way, and pitbulls have a bad rap, much as dobies and roties used to. We have had labs for years, but after the last one died, we ended up with a 7 week old pit. I had reservations, never having been around one, but they can be great dogs. Yes, ours is very protective of me, and of the grandkids. But so was our lab. (sidebar: When my brother was in Viet Nam, he told me that the army had trained a black lab as a "search and destroy" dog. I had a hard time believing it, but he had no reason to make it up.)
I have learned two things about pits. First, my son is Lunchbox' primary person. I had to do the "alpha domination" move fairly frequently to convince Lunchie that I, too, was a boss! Second, he is a lover. And needs lots of love. Belly rubs are required when we return home. He doesn't sit next to you, he lurches sidewise so he is firmly pressed against you.
As far as care, he is never out unless he is tied, and never out unless we are home. He was house-trained in three days, has only had three accidents in three years, and does not chew up anything but his "babies" (stuffed gingerbread men with squeakers, and only chewed up after the squeaker quits). He is mellow, seldom digs, and rarely does not like someone. Also, our vets loves him to death because of his sweet personality! He is about the most popular dog at the vet's office when we visit. Sorry to be so long with the pit plug, but you know how it goes with us "reformed" people. /forums/images/graemlins/crazy.gif
I think they have robot dogs now, you might want to try that! Chris