There are a lot of subtle differences in many 1911's.../ and in features...
As you add features the price goes up.../ that's why a gun like the Springfield TRP - that comes with a mag well, is checkered on front and back strap, ambi safeties, night sights..at around $ 1,400 or so in my area is a lot of gun for the money.
Can you go cheaper - and get a decent gun...maybe, maybe not.
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In my opinion - Wilson Combat ... makes the best 1911's on the market but the entry price to play in that category is around $4,000 .../ I've had Les Baer's, Ed Browns, Nighthaws and Kimbers...and none of them were as good a gun as my Wilson's ( 9mm full sized wilson all stainless - Protector - 8 yrs old about 110,000 rds thru it now .../ CQB full sized .45 acp armor tuff black has about 30,000 rds thru it )...and the 9mm full sized is my primary carry gun now.
Buddies that shoot Springfield TRP's like them a lot ...and some of them have 50,000 rds thru them...and counting..