I agree with mjkeat on the Hornady TAP. Excellent round. Used extensively by law enforcement.
Plain old M193 ball is also an excellent defense round. The bullet will usually break apart at the cannulure on contact with something soft like tissue, and tumble. This increases wounding potential and decreases penetration.
I didn't fight to defend your freedom so you could vote to take away mine.
"A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
John Stuart Mill."