If you are looking at Nightforce w/ Zero Stop, then you could (should) be looking at the Vortex Razor HD 5-20X50. The Zero Stop is awesome, the glass is better than NF, and you have 5 MIL per turn or 10 MIL per turn options. The reticles are great too.
If you don't NEED a Zero stop, the best deal going on a long range tactical scope is the SWFA SS HD 5-20X50.
http://www.youtube.com/watch?v=3iEK-tVheg8

