I have finally bought an AR15.... I seem to be searching the net for various configurations and accessories. I see there is a wide range of cost on the brands of the lower. I see even when the lower is stripped...there seems to be a wide range on the cost. I understand the quality factor, but what are the big differences to look for in the lowers? What is the big difference in the bare lowers? Is this the Levi's thing all over?