Don't Tread On Me Colt 6920
Colt 6520
Colt 6721
LMT comes in a close second. Forget the "pin size" nonsense. The Colt does have more mil-spec quality than LMT. It wouldn't make sense to not go with the higher quality rifle just because it uses slightly larger trigger pin that has zero consequences. I don't know why people cite this as a reason to lower Colt in the ranks of good AR's. There's always those people that emphasize the non-important things. Which is more important? Mil-spec steel grade and treatment or a pin size? If you go by the purist's logic, then forget everything unless you can grab a true M4 off the rack of your local Army base. The thread ends and so does your search.
Novesky is good, but remember - it is a custom AR. It really isn't an assembly line type AR like the Colt or LMT. They are basically a custom shop that makes AR's for duty/combat. That means their concern is usefulness for real-world operators and reliability. Whereas, most other custom shops make AR's for action shooting sports or total accuracy (Wilson, Les Bear, JP etc.)
Expect to pay a lot more for a custom shop rifle.
That means the Colt is the best value for getting the high quality parts, build and QC for the money.