Based on much of the feedback here and on thoughts of how I would be deploying this weapon I'm leaning towards option #1 - an Aimpoint. I'll need to give the specific model some more thought. One consideration that I had not included in my original list was a short dot option.
After reading the feedback in this thread:
https://www.m4carbine.net/showthread.php?t=4209
From USMC03, "The Short Dot gives the end user almost the same capabilities as an Aimpoint and an ACOG in one optic."
The S&B short dot would seem like an excellent option other than the $$$$