I recently decided I was going to try and build an AR15 rather than buying one from a manufacturer. When I was previously looking to buy a complete riffle I was told good things about colt, BCM, daniel defense and a few other but I'm a little lost when it comes to individual pieces. I've just started researching but so far some brands I have checked out are DPMS, RRA, Doublestar, Spikes and others. I'm wondering which of these brands (or other brands) would be your value brand, which is the bang for the buck, and which is the cadillac? and any recommendations would be appreciated.