I'll comment on your post backwards,
First off, when some one say's they got a ".45", there is only ONE gun that comes to mind, and it AIN'T a Glock

Congratulations on yours, enjoy.
As to the "Stopping power" issue, despite what Hollyweird shows, no caliber will guarantee knocking down your opponent ( T Rex doesn't count because it knocks you around no matter WHICH end you are on

) There are cases from Vietnam of VC taking multiple hits from .50 cals and not stopping
http://larrycorreia.wordpress.com/2008/04/29/one-shot-stop-handgun-statistics-and-why-theyre-a-load-of-crap/There are other references on the net, but I don't feel like searching for them right now, what makes bullets work is blood loss, damaging organs or breaking the support structure.
Obviously if you shoot off a kneecap, or smash the pelvis they will fall down but that (with a reasonable caliber ) is more a function of shot placement.
Personally I do carry a .45, but that is because I wanted a 1911 and there is only one caliber THAT should be in (OK, 38 Super maybe but ammo is harder to find

) also bigger holes bleed faster and while my .357 HP's might expand perfectly, my .45 will NEVER shrink.
There was a thread, "Tales from the Mortuary" that was posted by a Coroner that went into some detail, I can not find it now though, also Shooting Times has a column by a guy who worked for years as the ballistics guy in the Dallas PD crime lab that dealt with that in a past issue maybe 2 years ago.
Hope that at least helps point you toward some
documented research.