Rick,
I have 3.9 1911s (I'll explain in a moment) covering 4 different manufacturers.
Colt Mk IV Series 70 in 45 ACP - my first 1911, purchased used in 1976 for $125. Nice, reliable shooter, suspicious of the four finger collet bushing.
Springfield Armory Trophy Match in 45ACP. This is the carbon steel model. Purchased new in the late 1990s when the QC at Colt was questionable on the Gold Cup.
Ruger 1911CMD in 45 ACP. Recently acquired for about $650. Impressive fit and finish, questionable front sight durability.
ATI FX9 Commander in 9mm. Purchased for $400, waiting to pick up due to one pistol per month rationing. Manufactured in the Philippines by SAMI (not the company that makes the RIA pistols). Went into this pistol with the fore knowledge that replacing parts with after-market may require hand fitting. [This pistol was purchased with the intent of being the chassis for a switch barrel pistol in 38 Super.]
Both Springfield Armory and Ruger have demonstrated great customer service. I have had minimal experience with Colt CS, only because I haven't had issues with either Colt I own. I have yet to have any dealings with ATI CS.
If I were looking to add another 1911 to the collection, it would be influenced by the finish that I preferred. If you don't mind stainless steel, I would jump on a Ruger. [Actually contemplating a 10mm 1911.] If I wanted either blued steel or parkerized, I would look at either a Springfield Armory or Colt. I have little experience with Kimbers. On fixed income, finances tend to influence my purchase decisions.
I would suggest that you first decide what mission you want your 1911 to fill. Then let the mission and your finances influence the caliber. Then let the mission, caliber, preferred finish then finances influence the make and model you purchase. Typically, I would have difficulty looking to purchase any handgun that costs more than about $800.
Best of luck in your search!