Kahalua - Humane Society/SPCA of Sumter County, Inc.
I see this dog is still available for adoption. She has been there a very long time.
I have met many very sweet pit bull mixes. It seems to depend a lot on the owner. My sister-in-law picked up what looked like a pit bull/boxer mix from Max's Pet Connection last week. This is quite a nice pooch.
And some of the dogs at Doggie Doo Run Run which are pit bull mixes are afraid of my chihuahua/terrier mix. Granted there are some pit bull mixes that become aggressive and this is also usually because of the owner's treatment of it or control of it.