I have had a few 1911's and I wish I had kept every one of them. RIA, Kimber, SA, SIG, Colt, STI.
Do not think you will find a Colt for under 1000 that would be the best range gun.
STI's are great guns, great shooters, but each of mine were difficult to do any work on. Nothing was drop in. And...keep in mind that STI's have ramped barrels....field stripping is a PITA, compared with other 1911's. The Trojan would probably be your best bet. Not sure if they are under 1000.
Had two SIG's and they were very accurate. However, one had the slide slightly angled to one side and SIG's have the same series 80 safety system that Colt has.
Kimber's get a bad rap, I do not know why. I have had one in each of their 3 sizes. All were great shooters and probably the best value. They also all had the best triggers out of the box.
The Springfield Armory Range Officer is tough to beat. I have one in 9mm and had one in .45 acp. Cannot beat the accuracy, out of the box. Each was so 1911 standard, that every part I ever got was completely drop in.
[Side note: Unlike the RO series, lower model SA's did not all have great triggers and I am unsure of their slide to frame fit. The RO line is supposedly put together differently]
Currently, my pride of ownership 1911 is a Colt. My range gun is a SA RO 9mm. Now, highly modified.
You should be able to get a SA RO for $800. Then spend the $200 on a tritium or FO front sight, Les Baer match hammer/sear and VZ grips. Later, Cerakote the slide and frame and it will look like a higher end SA.
Hope this helps
Best
J