That's odd because when I was on the 9th Infantry Division Pistol Team (Composite Bullseye) we only used Colt Gold Cup 1911A1 45's. Still, if I had to choose ONE 45 for a "go to war" gun straight out of the box, knowing it would be 100% accurate and 100% reliable I go with the H&K USP Tactical. It'll take a threaded suppressor, too. I currently CCW an H&K USP (45) standard size. 12+1 in the gun and 12 in a spare mag on my left hip. I usually carry OWB in a Galco model "Concealable" open top and I use the "Concealable" 1.5 tapered belt with a Galco quick remove ammo carrier. Using components made to go together makes this an extremely comfortable rig and it virtually disappears under a XXL Hawaiian shirt here in Miami, FL. I wear a pastel t-shirt underneath and I'm just another tourist with a big belly. I compete IDPA with the exact same rig.
The 1911A1's can be incredibly accurate if you put the time into it. My old man competed for years in civilian pistol shooting (and still does) with a 1911A1. He has an FFL and built his competition pistol himself. When working on the gun, he would take a grinding stone, scrape the slider *once*, and measure it with a micrometer. If it wasn't perfect he would repeat the process until it was. Once when I was a teenager and broke, he gave me a box full of .45ACP shell casings and a micrometer, and paid me to separate out the good ones (within .005" of spec) from the bad. He was somewhere in the top 5 in the US one year, I think and was considering going out for the Olympics but the absence would have hurt his career.
It's not his daily carry-around gun, mind you, (with tolerances that tight it jams too easily), but it is an amazingly accurate weapon if you want it to be.