http://ammo.ar15.com/project/Self_De..._FAQ/index.htm
More info then you can possibly imagine on this topic with pics.
You will have information overload at the end of it.
Myself....I prefer a .40 or .45.
I use to sleep with my 92FS Taurus 9mm.....until I discovered it has a nasty
ability to overpenetrate due to the higher velocity and can go through walls
and accidentally injure someone else you didn't intend to.
Read this post
http://forum.pafoa.org/50747-post-4.html