I am going to purchase my first AR. Looking for a good rifle for target and HD. I have come to see that there is a plethora of makers and then there is the build your own. I will build my own, eventually. However, I want to get one with a warranty and get familiar with it before building one. Makes it easier. I have seen S&W, Bushmaster, DPMS, RRA, Sig in stores and handled them. I do not like the bushmasters too much. I like the Sig M400 and I also like the DPMS Panther A3 16". The sig is about 200 more than the DPMS. I am trying to keep it under 1000, plus optics. The guy at the store is trying to set me up with an Eotech holosight. Any input? Thanks BTW - I am not new to firearms, I have a H&K .45 for carry plus my hunting weapons.