I don't much care for pits, rottweilers or pinschers, I've seen all three go off kilter too much to suit me. We've got a big dog that I am getting to like though, he is half Great Pyrenees and half Australian Shepherd. Big boy bark for sure very alert and he is very athletic, thus far the temperament is superb. Takes no crap from the other dogs but doesn't offer any up on his own. Coat might be an issue, he's as hairy of a dog as I've ever had and that's for certain.
I'm old school about problem dogs. Sometimes dogs just run off or something and don't come back.