Nikon has decided to get out of the rifle optics business. There's quite a few of their scopes out there selling at clearance prices. Their tactical lines seem to be heavily discounted. If you check out the "guns.deals" website you will see some pretty good deals on Nikon scopes. I have been tempted to get a Nikon Black 4-16x50 for my CZ550 "tacticool" but haven't gotten around to it yet.

As for long rang shooting... I can't say what's best and what features you should look for. I'll say that I sold my nicest scope because it was too nice for what I do. But later I turned around and bought a rifle it would've been perfect on. So I bought a similar style of scope for about 1/6 the price. While I do notice a difference in quality between the two I have to admit it won't make much of a difference to my usage. I mostly just liked seeing folks reaction when I told them I had a $2000 scope LOL...