* most logistical support in these United States
* relatively cheaper to become proficient with
* better in the CQB role
* best accuracy
* effective out to 250+yrds
* reliable enough
Well, the question was "Best in all-around combat role", so I'm not sure some of your reasons for AR are sound...
most logistical support in these United States
Are we assuming combat usage within these United States? I kind of read "all-around" as meaning "anywhere". I would rather have a Battle Rifle or AK if I knew that it had to work anywhere, anytime for reliability reasons. Also, if you needed a rifle for all-around combat within these United States, I'm pretty sure the logistical support would dry up quickly... heck, Wal-Mart can't even keep ammo stocked now.
* relatively cheaper to become proficient with
I disagree again... you can get 7.62x54 or .30-06 relatively cheap in surplus. Plus, you can become proficient to a certain degree with .22LR in marksmanship before hitting the higher calibers. Plus, I would argue that proficiency is gained fastest through quality training combined with shooting... but the training is going to cost the same regardless of caliber.
This is debatable. The battle of Stalingrad is arguably one of the most intense and prolonged examples of CQB ever... nary an AR to be found. If the Germans had had AR's, would the outcome have been much different? I'm doubtful. In my mind, effectiveness in CQB is more dependent on tactics and motivation than rifle. Still, as far as the rifle goes, I think in CQB, I would prefer a round that could penetrate more than 5.56.
ARs have better accuracy than AK's, but they have nothing on many battle rifles. And what good is accuracy if you don't have range? Furthermore, many people are dependent on optics on their AR's for accuracy. How long, in all-around combat, do these optics last without breaking, wearing down, etc. The US Army has the logistics to repair / replace optics. Does the average citizen?
* effective out to 250+yrds
Probably all you need... but the other choices have the same.
In all-around combat, I don't want to be carrying something that is "reliable enough". That is my biggest argument against AR's. I want something that is absolutely reliable in all conditions with minimal cleaning for long periods of time. That is what I would expect in all-around combat situations.
I picked "Battle Rifles"...