I'm very well versed on hunting and handguns but admittedly know very little about Ar's and I'm interested in getting one so I'm gathering info.....Here's what I think I want accuracy is always important but I don't need a competition gun reliability is my main concern I want this gun for range and home protection work....I know I want a light and backup iron sights any other accessories???...For my main sight red dot or scope??? Do I want a vertical grip???? What brands or models do you guys recommend for what I need ???