Well I don't feel the need to have a complete AR from the same manufacturer.
I work in manufacturing. So if the parts are certified built to spec and the company has a good quality reputation, then I will buy from that company. I don't have a romantic loyalty to any brand either. I value function and reliability / price.
I intend to build or buy a complete lower from SAA for $150-180 sans the taxman.
Colt upper costs $550. BCM costs $775.
Total cost is $700-925.
I understand that some bushies and RRA are around 8-900.