I use Nikons on my Hunting rifles one is a 3-9X40 Monarch and the other is a 3-10x50 Monarch.
Both mine seem to have a narrower field of view as compared to Leupolds and such. Also the 3-9x40 did not have much adjustment in it, meaning I had to get just right rings to make it sight in. Both these scopes can peer into the shadows better than my eyes can, at any distance, any time. If you're going to spend that kind of money, look at others too.
My hunting rifles aren't pretty and thats for a reason. They get laid on the ground while I climb a tree, and get pulled up by rope and let down. They get knocked around a little in the process. I've had the 3-9X40 for 3 yrs and it's withstood my abuse pretty well.
Glass quality excellent. (IMHO)
People say that the Leupold II series is as good or better than the Nikon Monarch series and the Leupold II are a little cheaper.
My money is on the Nikons
Hope this helps.