Bringing this thread back to life just because it's a fun topic for discussion :wink:
Since I'm here, I'd have to go with a scoped, bedded bolt-action with a free-floated heavy barrel and a bipod. That would be one fun rifle. As a matter of fact, I may just have to make that my next rifle!
The AR is definately a worthwhile platform, and capable of some scary accuracy, but if I was gonna have only one .223, that wouldn't be it. If I already had the one mentioned above, I could definately see an AR carbine with a free-floated barrel in my future.