The "Loaded" model Springfields is their "mid-range" production 1911. The Mil-Spec is now their bottom line entry model, and the TRP is top of the line.
All come with the "coupon" to get extra stuff at reduced prices.
The Loadeds, depending on the model vary in price from $800 to $1000. The TRPs are in the $1400 range. The TRP offers better fit-up (better accuracy) as well as some additonal features like checkered grips and a magwell. If you added those features to a Loaded, you'd spend more than the price of a TRP.
A major point with the Springfields is their "no questions asked" (essentially) warranty, which applies across their product line. I have several Springfields, from the bottom of the line to the top and they are all good values at their respective price points.
The Remington and Ruger also appear to be good values, but don't have any personal experience with either.
For best value, I'd look for a used TRP which should be available for around $1K. Springfield honors their warranty on used 1911s, although officially it applies only to the original owner.