I have the Carl Zeiss 6.5-20X50mm mentioned earlier in this thread on a Savage .308 F/TR. I am very pleased with it, and I routinely shoot beyond the ranges you've mentioned. Personally, I prefer more magnification than this scope offers for shooting at distances over about 800 yards. My next glass will have higher magnification....say something like 14-30X variable with an objective of 50+mm. I have never own the Nightforce scopes, but I hear positive things about them. I do have a safe full of Leupolds though, none of which I would recommend for long range target shooting. S&B probably is the best if you've got the coin.
T2E