I hate ACOGs. Biggest issue with them is eye relief and exit pupil, which are both unacceptable on most of the earlier models, and barely workable on the 3.5x. They are a great scope for issuing to troops who need a rugged optic that takes a beating, and basically stays put even better than iron sights. We were constantly replacing front sight posts on the M16's and M4's in infantry units for getting bent from use and abuse.
I am all about the variable power tubes that have a 1x-4 or more. What part of the country are you in? It makes a difference. For example, I'm out West, where I can't bring enough gun to the desert and mountains. A 20mm Laht anti-tank rifle would barely cut the mustard for many of the distances we have out here.
Once you get into the rolling farmland of the Midwest, distances start to shrink, depending on the season. Over the Mississippi, and now you're in the sticks.
For the "Recce" profile gun, which is basically packing as much SPR performance into a 16" carbine, I really like 1-4x24, 1-6x24, and 2.5-10x32 or 2.5-10x44 out here in the Rocky Mountain Region. If I was back in East TX, LA, MS, AL, GA, FL, SC, NC, TN, KY, VA, PA, NY, VT, NH, ME, a 1-4x24 as small as possible would be fine.
One caveat might be the Appalachians if I were at elevation or foothills, but you still have a lot of dense forest in those regions.
If you are in the high desert of WA, ID, OR, NV, AZ, CA, NM, TX, UT, or CO, I prefer the 2.5-10x. Based on these parameters, I would recommend either a Vortex 1-4x Viper HS or PST, or the 2.5-10x32 or 2.5-10x44 PST. All are within your budget, have zero-stop, different reticle options, capped or target turrets, MOA or MRAD, SFP and FFP.
If you live in the sticks or a larger urbanized area, get the 1-4x24 with illumination. If out in the countryside, consider the parameters listed above as you make your selection.