From my experience with AR type rifles, they are all about the same. The S&W is a good value, but from what I have seen from several of my friends rifles (one having a DPMS, one a Daniel Defense and one a Palmetto [I believe]) they all shoot and function the same. I didn't notice any difference in quality etc. I do understand that once you start free-floating a heavy barrel and hand loading etc, they tighten up, but for your 200 yard purpose, I don't think you will be disappointed with any of your choices listed.
I personally would go with an M&P AR15 that is already assembled (but that's because Im a Smith fan to be entirely honest) you can always go back and change things on it. The AR platform is a very modular rifle, and many of the parts you find are made by the same manufacturer (just with someone elses name on it)
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