If you are truly going long range and dialing up for adjustment Nightforce is unmatched in repeatability. Those scopes will put up with a lot of abuse and keep on ticking. Like anything of that quality, its not cheap.
isn't a bad scope in my opinion. Its just not a good one either. I think the vertical adjustment is very good and repeatable. The windage dial is not. I think they put their stock in the reticle being the primary windage correction method when they redesigned the Jap model that it originated from. Optics are not on par with other scopes in its price range either. I think this scope is a $650-$725 scope at best and they retail for much more than that.
Leupold's are not bad for the money. To me they are the best bang for the buck when it comes to ruggedness, repeatability, and optical clarity. You can find 4.5-14's and 6.5-20's for less than a grand used in most cases. I would recommend those going either newer Mark 4 or VX3 (opposed to VariX-III or VXIII) as they did make some noticeable upgrades although neither will be a bad choice.
I had limited time with a Weaver tactical model about 1.5 year ago but it seemed to be a decent scope too. Only thing Weaver I have ever touched though and it was only for two 3 shot groups out of a .308.
I've also used a Konus tactical M30. This was on a very high end AR rifle in 223 so the comparison is not exactly apples to apples. I will say I was highly skeptical of this scopes capability given its retail price and all the bells and whistles it had. I tried everything I could to find a fault with it and after 150 rds down range I just couldn't. Not saying rush out and buy one tomorrow but depending on your budget is this may work for you.
To date I haven't had the opportunity to put a Vortex PST through its paces. I've been dying to though. I've been saving money for a spotter so it looks like it will be a while unless one of my friends happens to buy one that I can try. I won't comment on it one way or another until I try it but everything I've read to date indicates that it is the best economy long range scope
I won't bash Nikon because its been about 10 years since I've seen or used any but in my opinion they make good glass and that's about it. Tracking systems, main tube construction, overall ruggedness, etc just aren't on par with other manufacturers in the same price range.
Just my $0.02. Good luck.