Back in the early 70s, I was a revolver affecionado. I carried a Colt Python on duty. A friend of mine was a GMG1 (Navy Gunner's Mate, Guns First Class Petty Officer) and we were talking guns. I was young and impressionable (Dirty Harry was IT!). He took me to the armory and had me fetch loose, used 1911 parts out of bins on a wall and built a 1911 A1 out of parts in front of me. He dry-fired it a couple of times, grabbed a couple of boxes of jacketed military hardball rounds and a couple of targets and off to the range we went.
He fired several very respectable 2 inch groups at 25 yards with that parts-gun 1911. It rattled and clanked when he shook it, but it still shot 2" groups; more than adequate for anything but competition shooting... and it taught me a lesson. I became a true believer, and I've worshiped at the alter of the 1911 ever since.
I sold both the stainless '99 Defender and Y2K XSE I carried on duty for ten years last month. I'm down to a single .45 now, and it's a 1911 model 70 parts gun I built for a friend in 1995. It came back to me a couple of years ago, and has sat unused in my gun safe ever since. It's a matte, blued Essex standard government frame, parkerized Colt Model 70 Gov't slide and barrel, with a blued custom barrel bushing and some Ed Brown stainless parts. It's got Novak three-dot ramped concealed carry sights. Last week, I updated the beavertail grip safety, trigger, and mainspring housing to suit my hand (my friend had some custom work done to it some years ago to fit his hand). It's now my primary carry gun. It ain't pretty, but it's a pretty awesome performer. BTW, I'm not a gunsmith nor do I claim to be one... but a set of jeweler's files and a really smooth whetstone can do wonders for fitting parts into a gun. Remember, John Browning designed this gun to be used on the battlefield. They're simple and easy to work on or build as a do-it-yourself-er.
As long as the gun is a 'standard' 1911 using 'mil spec' interchangeable parts, (rather than custom-design proprietary internals) any 1911 is likely to be able to out-perform the hands holding it. As long as you don't have special demands for the gun, (like tack-driving exhibitions or competition range work) get the features you want at a price you can afford. They'll all perform pretty much as expected. The difference in 'mil spec' 1911s basically comes down to accessories, millwork, and finishing. Oh, and you pay premium prices for premium names... and don't get much else when it comes down to performance. The Colt Gold Cup remains the pinnacle of accuracy in a production gun... and it's been out what... fifty years now? In any event, the truth remains that most of us will never be able to shoot any 1911 to its potential.
You can pay a fortune for a really nice, gorgeous gun that doesn't shoot any better than my 'parts' 1911. Most of the advertising hype around these guns is just that... hype. The manufacturer (provided that quality materials are used) isn't of as much importance as parts interchangeability.