Yeah a 12-42 power anything isnt going to yeild very clear images, whether its a NF or another scope. 22 power max and you will see why they are worth the $$. I can see 30 cal bullet hole in white targets at 600 yards through a 22x NF with good light.
A solid second choice is the original Mark 4's by leupold. The only draw back is they cost as much as an NF and you get more scope in a NF. A 3rd choice is the new mark 4 variables.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.