Your list is pretty good. If you can only buy one rifle, I would buy an AR that does NOT use proprietary parts. Stay away from the piston guns for ease of repair and replacement.
The BCM and Daniel Defense are good choices and can use standard parts that are readily available.
I think the Radian Model 1 is the best, but it is very expensive, there is a waiting list, and the Model 1 has a Stainless Steel Barrel. The stainless barrel might be slightly more accurate, but has a much shorter life span. In addition, the Radian has a few proprietary parts that you can only buy from Radien.
I think the LMT is good rifle, but is over priced, in my opinion.
I think the DDM4 V7 is a solid choice, but you should buy an aftermarket trigger to make it excellent. It also comes standard with a forged barrel and an excellent rail.
The BCM is good, but make sure it has a forged barrel (BFH barrel). This will increase the longevity of your barrel. You will want a better trigger for the BCM too.
If you have the ability to buy a Geissele, I would consider that. The Geissele, is a little more expensive, but it is really a fine rifle. And it comes with one of the best all around triggers available. The barrel is forged, the bolt carrier group is superb, the rail is tough and well made. The buffer system is robust. I would look hard at the Geissele Super Duty in 5.56. You can repair it with standard AR parts as well. I have two of these and they have been absolutely excellent. I have them suppressed and have had no problems. On my 14.5" and my 11.5" Geissele rifles I've run my Surefire RC2, Griffin Explorr 224, and a AB A10 suppressors with excellent results. Just put an H3 buffer in the 14.5" to keep it from getting beat up.
I have four FN SCAR 16s and 17s and three Sig Sauer MCX LTs, but I still recommend the AR platform for all around use.
I specifically don't recommend the HK because it is extremely over gassed, proprietary, heavy and ridiculously expensive.
My choice would be the Daniel Defense or the Geissele right now.