I have a Stainless Kimber Pro Carry II. I have carried it before, although I carry my XD40 SC a lot more. Not because I don't trust my Kimber, but more because it's a very nice pistol and I'd rather see the wear and tear of every day carry go on my XD. When I do carry it I have a Wilson Combat mag in it (8 rds), one in the chamber and usually an extra 7 round mag in a pocket.
While it's always better to be safe than sorry, my philosophy is if I can't hit the target with my first 9 rounds, I have no business carrying my pistol in the first place. With a .45 its unlikely it would take any more than 1 or two solid hits to stop the threat.
Of course there is the chance for a multiple target threat, but with 16 rounds of good .45 hollow points, I feel pretty confident that I'd be able to handle most any situation.
If you like 1911's then why look for something else? I'd just get a 1911.