HoosierDave1967 I understand your affinity for an AR-10. My first rifle was an M16 (back in '72-75) but it only made sense as an automatic weapon that can shoot 3 round bursts.
I like your list because it implies that you want top quality and are willing to pay for it. However, you've overlooked what I believe is the best AR-10 out there.
The POF .308.
What makes POF different is
1. It is a piston rifle not a gas impingement AR, and that is
a big difference. If you don't know the difference, find out.
2. The POF is also one of the few that has a 20" barrel, which for a long range round like the .308 is a must.
3. The final reason that makes it unique is that all its components are coated in
NP3. That is a special Teflon that goes into the metal pores. Nothing sticks to it. You will never have to worry about copper fouling in the barrel or carbon build up. Everything just slides off with a patch. Once you experience it you'll want it on all your prized guns.
The first time you shoot you know you've got the best semi rifle money can buy. Great for pig slaughtering.
I mated mine with a Swarovski Z6 5-30x50 and it shoots almost as well as my Savage 10. It does have about 1/4 inch more dispersion at 100 yards.