I agree with the above. As a general resouce, it's not a bad idea to pilfer the data at photodo and photozone.de to get an idea of what is what. There are no dogs in the current Nikon lineup; likewise, I don't know of any bad older Nikkor lenses; I only had one bad experience with a new Nikon lens and that was one of the very first 80-400 VR offerings, but I understand that it has now been greatly improved and even the nutty 18-200 VR is said to be pretty decent. However, there are some *awesome* Nikkor lenses and some like the 50/1.8 that give truly remarkable bang for the buck.
Incidentally, I suspect that the very best zoom in Nikon's current lineup is the 70-200 VR, and the best prime in their current lineup is perhaps the 105/2.8 VR, if one factors in distortion and VR and all that, which isn't relevant unless you plan to get a VR-compatible body. But there are many, many very fine and much less expensive non-VR or manual lenses. The older Nikon primes are excellent. My favourite walkaround lens is a manual focus 105/1.8. Love that thing.
If you have the $$$ and don't mind manual focus then consider the Zeiss ZF lenses for Nikon mount.