I would go with the ACOG in a LaRue Tactical mount. Lightweight and serves as a great optic. I would recommend a MaTech USGI backup iron sight. Once you get it sighted in for windage, you can adjust it for windage out to 600 yards from 200 yards dope.
I think I'm going with a Trijicon 3-9x40 with mildot Amber Crosshair reticle on a LaRue SPR QD mount along With a Trijicon RMR 9 MOA on a half ring mount replacing the half ring LaRue SPR mounts front ring. Placing the RMR at 1 o'clock.
Then I have the best of both worlds.