bsa,
The higher quality AR's are still mostly unobtanium in my area.
Del-Tons, Radicals, etc are still floating around.
Don't see many .308 AR's come up in the gun shops here, so I can't offer a lot of info. My LGS did have a Sig 716i that I considered on a just because basis. But, I'm not a .308 guy and finally decided I didn't need yet another caliber to support all the way down the tree of peripherals. It sat for a few days and finally got scooped up. With the Sig optic, it went for $2300+. They had another 716i that went for a little less. I just called my friend that runs the LGS and asked him what he thought your AR10T with bells and whistles you left on it would go for. He said $2000-2500.
Just for the sake of your comps, a quality name brand 5.56 AR is fetching $1800 and up here.
Hope this helps.
GLWS.