Regarding what to stay away from; Hesse, Vulcan & Blackthorn are all the same company and have a craptastic reputation. The Superior Arms lowers are also a crap shoot as far as quality and specs go.
For a law enforcement/self defense rifle, Colt, Bravo Company, Spikes, & Daniel Defense, S&W, RRA are all good.
For a range rifle, I recommend purchasing a RRA lower and a rifle kit from Delton. Their kits are good quality and priced right. I have built up three rifles this way and they are all reliable and accurate. Plenty of people on here who would help you put it together.
For a law enforcement/self defense rifle, Colt, Bravo Company, Spikes, & Daniel Defense, S&W, RRA are all good.
For a range rifle, I recommend purchasing a RRA lower and a rifle kit from Delton. Their kits are good quality and priced right. I have built up three rifles this way and they are all reliable and accurate. Plenty of people on here who would help you put it together.