I am not sure I made "wise" choices in the process, but I am fairly happy where I ended up.
If I was in your shoes, I would get it for the .223 first. Good for HD, fun at the range, depending on barrel and such, does not hamper handling too much. There are a LOT of chocies and what you use your AR for may make this the perfect, or not a good, choice.
I tend to like supressed striker fired 9mms a lot more than suppressed .45 1911s.