When making this choice, you really need to be honest with yourself about how you're going to use the rifle.
When I'm confined to shooting at shorter distances, I make up for it by shooting at very small targets. I prefer optics with finer aiming points.
You have to decide what's important to you. Everything is a compromise. The Elcan is a sweet optic, as it should be; but it is built for "combat." The reticle looked to me like it's designed for fast target acquisition on larger targets. It performs well in its intended role, but not a general purpose optic for me. It is tough, but it also weighs as much as my NX8 in the mount.
As for the NX8 vs ACOG, the NX8 is, for its size, robustly built and despite its shortcomings, it's a very capable optic. The ACOG is VERY robust. Its the one optic I have that I really don't worry about ... at all. In terms of ease of use, size and weight, nothing beats an ACOG stack. The ACOG with cross hair reticle allows me to just about anything I'd want to do within about 400 yards.
Have you ever used an ACOG? The 4x is nice, but you really need to pay attention when using it, especially from less conventional positions. Everyone I know, myself included, has busted their nose, brow ridge or some other part of their face due to the short eye relief. The TA11 just works better for me. Although the TA11 has a smaller field of view, is larger and a bit longer; the benefits are an extra inch of eye relief, larger exit pupil and a bit more forgiving eye box.