Any of them will be accurate for hunting and self defense. If they weren't the military would not use them.
Get an AR15 in the $1000 range and it will do anything you can reasonably ask of it. Get one in the $600 range and it will probably still work for you.
However, they are not benchrest guns. They're not going to be putting all bullets into a 0.25" hole at a hundred yards, but every single AR I have ever heard of, assuming it is properly maintained, will easily be capable of practical accuracy. By that I mean capable of a kill shot on a man or deer sized target out to ranges of 250 to 300 yards. From what I have seen, anything less than 6moa is capable of reliable "accuracy". For farther ranges you have DMR and purpose built long range rifles. A big part of it is pickig your battles. It seems that lots of people will take an offhand shot at a target 600 yards away, or pick up a gun for the first time and shoot a handful of bullets, and immediately proclaim that the gun is not accurate. That is an inherently flawed technique as it relies primarily on user error.
As a big example of what I mean, the Mini14 is regularly called too inaccurate to use, and every single one I have heard of shoots under 6moa. Enough to guarantee a hit on a deer at a hundred yards with a center mass shot, and enough to guarantee a hit on the vitals at less range. People use benchrest accuracy to judge practical rifles.
So, the short of it is buy any brand of AR you want, get experienced with it, maybe replace a few parts to make it suit you better. The S&W ARs should be arriving in country soon at something like a $800 price point, that could be a good choice. Or Stag, or DD, or Noveske, or Hera, or Colt, or ATRS, or KAC, or Motiuk, or BCM, or...
They'll all work, the problem is that the government won't let us hunt with them. If NR status is your goal, check out the XCR or ACR. Expensive, but they should work.