I have no experience with NightForce but have 2 Leupold scopes and think they represent one of, if not the best, overall values in shooting optics. This is based on the following:
1 - Optical quality. I had a Zeiss Conquest (admittedly not a top of the line Zeiss, but a Zeiss none the less) and my Leupolds were comparable in clarity and resolution.
2 - Build quality. Leupold scopes are built very ruggedly and have an excellent reputation for standing up to punishment.
3 - Customer service. In the unlikely even that you have a problem, Leupold will take care of you without any hassle.
I am not saying that Leupold is the "best" scope out there, but it is the best scope I can afford and that makes them a good value to me. If I could afford a US Optics, S&B, or a Nightforce, I would probably get one because they are all excellent scopes.
Hope that helps.