I really don' t think you' ll be dissappointed with any of the manufacturers you listed. Armalite is interesting, because they carry the AR in larger calibers. With the type of shooting you are doing, you' ll probably want to get a flat top receiver. A lot of people really like the Bushmaster right now. I have a Colt Competition and am happy with it. I think the next AR I get will be a Bushmaster shorty. You have so many options with an AR.