The only benefit to the NM rear sights on the "Loaded" version is that the windage is 1/2 moa per click vs. 1 moa per click on the Standard. The elevation is still 1 moa per click, because it is an un-hooded rear sight.
The barrel, is a National Match barrel, which may net your some improvement for the moa, but unless you are bench shooting, Match ammo, you will not notice the difference, and you run the risk of the chamber being finicky with surplus or cheaper ammo.
The trigger is a National match trigger, but it is an after market, Springfield cast trigger group. You will more than likely be better off getting an USGI trigger group to replace it anyway, and keep the Springfield for a spare, no sense in spending the extra $$ for the spare. The difference between the NM and Standard trigger is @4.5 lbs of pull vs. 5-5.5 lbs of pull, hardly noticeable. You will get a much better trigger by buying USGI both in quality and pull.
The above statement is about the same for the NM flashider, it is Springfield cast vs. USGI forged. You can get a neutered (no bayonet lug) USGI flashider for @50-70, if you shop around. But I doubt that you will need to.
You will not be able to tell the difference between the Loaded and Standard under normal shooting conditions, so to get the Loaded, is IMHO, to put extra $$ toward no more satisfaction. That being said, if you really want the Loaded, no one that I know would call you a fool, it is a very fine rifle and you will enjoy sending lead down range with it.
Remember that the Standard is probably @ 90% as accurate as the National match, so the real factor in accuracy will be the nut behind the butt plate
If you get the Standard and find it to be less accurate than you want, you can sell it for what you paid for it, if you get a good deal, and buy the Loaded or National Match as you desire.
Good luck
