Eotech, all the way. I have one on my 20" Bushy, man is that gun fast!!!! Sight aquisition is increadable. Just find your target in the circle and use the 1 MOA dot to fine tune your point of impact. I have the 511.a65 on my rifle, it uses the "N" style batteries. The sight itself is shorter than the ones that use AA bat's. No need in the NVG version, unless you have the goggles to go with it. I also looked at the AimPoint sights, but they have a single 2 MOA dot, harder for those longer shots. My Eotech is good for yots @ 200 yds. but not much more. Good luck, and let us know what you get.
