I can't remember if i've posted on this forum yet or not, but I would go the BCM route. BCM is great quality for the money. Once you past about 1500 you kinda lose out on your price to performance. However some people want to build the best rifle that can be built and more power to them. I will spend my money on other guns or ammo though. My AR is an SBR, but I went with an aero precision lower with a bcm upper. lower was about 250 plus transfer fee and my upper was about 850 with a BCG. I ended up getting a radian raptor charging handle for it but really any charging handle will be fine. You could probably just got full BCM for around 1200-1500 depending on your options.