Not bad options, Ava! You've done some homework on this! Looking at all the holsters you've listed, my money goes to the *******. Montezuma is vertical, and Anatolia is a molded leather, not good for various other sidearms a treasure hunter might pick up in the heat of battle.
The holsters and mag pouches are completely interchangeable, so they can be swapped for horizontal or non-molded models rather than whatever is shown in the demo photos. I was just looking at the base shoulder rig itself.
If I can find a good sale, I'm considering picking up a ******* and trying to modify it with a new back panel. I can build a custom holster to fit whatever prop gun I'm carrying.
Not directly related to costuming... ZOMG1, the tech in this game! I've been reading about the specs on the new character renders. Drake on PS4 has 800 facial combinations (PS3 had 120), and every single hair on his body (even chest hair!) has real physics and can blow in the wind, get wet, behave differently as he moves around, etc. The demo videos are AMAZING. Also, Nate's eyes are now obviously blue (
http://imgur.com/a/sVn6r#0), instead of vaguely-hazel like they looked before. (At least I thought they were hazel. But I'm actually okay with blue, since that means mine are now accurate.)
Video of facial demo:
https://www.youtube.com/watch?v=pOpz6Wu5Mxw
OK, fangirling over; now back to costuming: The blue UC4 Henley has a slightly wider collar than previous shirts, and the shoulder rig has wider pads on the top:
http://i.imgur.com/0iXpYsM.jpg
More costume shots (including distressing!) here:
http://imgur.com/a/sVn6r#1
Also, for anyone interested in dressing as [other character whose identity is revealed in the gameplay demo but I won't spoil it for anyone who hasn't seen it yet]
I noted that he has a tattoo on his neck. Visible here:
http://i.imgur.com/SRjMZCO.jpg