The NF scopes are excellent, and in your pricerange.
If you will be hunting 300+ (and no less) I would look into the 8-32x56, over the 5.5-22x56, but that is simply my opinon. The 5.5-22 will work just fine, but I like the higher magnification for load development and range shooting. If I can zoom in on the bull REALLY close, I can see where my shots are traveling and how they're flying and hitting the target. It's nice to not always have to have your spotting scope when sighting in or load development.
I have never heard anyone having issues with the NF scopes in low light, including professional snipers, sharp-shooters, pros, and comp shooters.
However, everyone's eyes are different, so with his eyes, he could have very well had issues. I have looked through $3,000 Schmitt & Benders that looked as cloudy as a $75 BSA scope. However, that could have just been my individual eyes...
Go to a good store that has good high-end optics. Ask the salesman if he can bring the scopes outside for you to look through b/c you can't tell how good they'll look inside. Look through as many as you can, and pick which one you like best.