I would say POF (Patriot Ordnance Factory), I have .308 of theirs and if I could only have one that would be the one I'd choose. It's a piston AR and it has NP3 coating. You can pay more for but you won't get a better rifle.
"Socialized Medicine is the Keystone to the Arch of the Socialist State.” -Vladimir Lenin
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." - Thomas Jefferson (An early warning to Obama care)