@HansGruber likes #4. Lots of people do. I buy it to train with because it's cheaper, or used to be. For HD they're all loaded with 00B. Lately I've done some testing and I'm really liking the Federal Force X2.
As for the AR, my reasoning is simple. For non barrier penetrating, M193 is better for SD than M855. In my situation I am not worried about over penetration. In fact I think all the hoopla about over penetration is largely just internet gun forum blather. About the same as modifying a trigger on a carry gun. Yeah it makes perfect sense on paper and yeah people in apartment buildings have different considerations than I do, but in the real world it just isn't something that happens. I understand it absolutely could happen, particularly with a rifle round as opposed to 00B, but it simply doesn't apply to me personally. I would almost have to be trying to shoot from inside my house and hit something outside the house.
Also, an AR is not my 1st or even 2nd line of defense inside my home. ALL of mine reside in safes. If I break out an AR for a SD situation it would be an extraordinary event and would almost certainly involve multiple assailants, out of doors. The likelihood of which is very near zero.