The SS scopes are built hell-fer-stout, and the clicks on the 10x and 16x that I have are very repeatable. The crosshair is a little thick, but as Bob indicated, that doesn't necessarily have to hold you back as much as you might think. The parallax adjust is a little touchy on the higher power (16 & 20x) models I've used, but again its still one heck of a scope for the money.
Another option might be a Weaver T24 or T36... costs about $100 more, has 1/8 minute clicks (if you need 'em), a fine crosshair w/ 1/8 moa dot in the center, front parallax adjust, and the clicks are again pretty repeatable. Biggest drawback is it is a 1" tube, and only has about 40 moa total of adjustment, so you'll definitely need a 20 or even 30 moa rail to get it to 1k and still have enough range of adjustment to be usable. The SS scope most definitely does not have that problem - don't recall what the 20x model has, but the other ones have some ungodly amount of adjustment; something like 110-120 moa of both windage and elevation. Plenty even for a .308 Win
Don't know much about the Nikon scopes... I've heard they have good glass - which does help on some of the darker more over cast days. Some places see those sort of days more than others, so it may or may not be a factor for you.