Re: Nikon Tactical Scopes
Leupy Mk4's are significantly more than $700-800 unless you get a used one. So if quality is the same Nikon has an advantage there. Nothing lacking in the Mk4 though.
I just had to make the same decision. I too saw little difference between the mk4 and Nikon. I heard some abou the IOR but could not look at one in person so when I found a deal on a Nikon I took it. I don't have the scope mounted as I'm waiting on the rings, but I'm pretty impressed with it. It'll do everything I need out of a scope and I really like the turrets.
Beware that most of them on eBay are Nikoplex...I really had to search to find a Mil Dot from a seller on snipershide.com. Those are sold out most everywhere; when the new stock comes in (I'm told May-June), price will be $900-$1000.
I read several different Nikon reviews online and they were very favorable. I think that's the reason they are so scarce...it seems a lot of people felt they were a good deal for the price.