My plan would be first to get the shortest OAL AR with a 16" barrel in 5.56x45 for my first one--self defense and plinking. Then I would get an upper in either 6.5mm Grendel or 6.8mm SPC with an 18-20" barrel for hunting.
And to protect from civil unrest when the police won't intervene. https://bearingarms.com/rjgirdusky/2014/12/01/when-assault-weapons-saved-koreatown/
Nothing should ever, ever, EVER stand in the way of one Americans right to shoot another american for a variety of reasons. Pistols, machine guns, bazzoka's, everything should be available to everyone.