Nikon are great scope I just got one for my new AR ifn it ever gets here. I have the 6-24x50mm Monarch.
I think an 8-32x40mm or slightly larger objective will do you good.
Of the three you listed I would look at the Zeiss the hardest. they are the best quality of the three you listed.
The nikon monarch line are great scopes but I am thinking you need more than that in your application.
Don't rule out IOR or Sightron scopes as well.
There is a guy over on GGVG index
that is selling Sightron SIII scopes for a great price.
Sightron has a 10-50x60mm that will out shine anything leupold and nightforce can do and it is only $985 from Larry Scott over on GGVG. He is a great guy and will answer any question you have about any of his products. I have bought from him before and he is a great guy to deal with.
The drawback to the sightron is it comes in fine plex 1/8 and 1/4 dot reticules. I think if you have a click chart and know your rifle you don't need them mill dots. I have seen and looked through both the nightforce and the sightron and it really does blow the nightforce out of the water. the 10-50x will give you a great range of power for many different shooting ranges and it has a side focus for quick and easy focusing in the field.
Sightron Riflescopes / Binoculars / Sighting Scopes product pages. SIII Series - SIII SS 10-50x60 LR TD
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