Here's my $0.02. . .
It all depends what you want or need the pistol to do.
If you are shooting bullseye where 50-yard accuracy is critical to winning matches and where you need a pistol that will put 10 consecutive shots into a 2-inch circle at that distance, then you need a hand-built gun. To my knowledge, there are no production 1911s in .45 ACP that can do that. Actually, the best bullseye gunsmiths will build you a gun that will put 40 consecutive shots into a 2-inch circle at 50 yards.
It starts with the barrel. If the barrel won't hold a one-inch group at 50 yards, it is virtually impossible to build an entire pistol around that barrel that will hold 2 inches at that distance.
So, a good bullseye gunsmith will test a bunch of Bar-Sto or Kart barrels with a lot of ammo that produces known accuracy in a barrel fixture. The one(s) that will shoot an inch or less (10 shots) are then selected for the build. The others are either returned to the manufacturer or set aside for less demanding applications.
In the old days, improving the frame to slide fit was a function of peening the rails and squeezing the slide. But these days, the best guns are built from scratch using oversized Caspian frames and slides. These are machined for zero play, and the previously selected barrel fitted.
There's a lot more. The best bullseye gunsmiths touch every single part going into the gun, and often smooth, polish, fit, etc., every one of them, including the grip screws.
I could go on, but you get the picture: it takes a lot of experience, knowledge, and time to build a pistol that can do this, and do it every time, with reliable function. That's why the gun costs $2,000 or more.
Now, most people don't need that level of accuracy, and spending that kind of money if you don't is your business, but I wouldn't do it -- I'd spend the money on something else.
I've had bullseye 1911s built on Springfield and Colt assemblies, and they are both good. But nothing can, IMHO, beat a bullseye .45 built on a Caspian frame and slide by David Sams. Super accurate and reliable, and built so carefully that the gun will probably never shoot loose.
It has always amazed me, actually -- S&W produces a .22 and a .38 that can shoot this well (Models 41 and 52), but no one, it seems, have ever built a .45 that shoots this well as it comes from the factory.
Bullseye