One thing to think about is that with the new 24-70 2.8 VR there should be a big supply of the now "old" 24-70 2.8 s available as pros upgrade. I've seen quite a few used ones already but they are still in the $1000-1500 range. Perhaps after the VR is in wide use prices will drop down (I hope).
What is cool to me to think about is that say instead of dropping $2000 on a new top grade Nikon lens, for the same money a person could buy something along the lines of: (1) the same lens in an older generation ($800-1000?), (2) plus a new 3rd party specialty lens (say Tokina 11-20 2.8 $550), (3) plus an older generation Nikon super high quality portrait lens ($300-650?), (4) and possibly even another 3rd party high quality zoom/other used or new (say sigma 17-50 2.8 $250-320). Having said that, if I were making a living from photography rather than just a hobby the $2000 for the best lens would be worth it to me fore sure.
I can post some pics from the 80-200 with the 7100 if you want cuz it's really sharp even wide open. But i need to read up on how to post pics in the forum. One thing I noticed though is with that combo that live view gives more consistent focus for very long range targets when shooting at or near wide open. But then I did set the 7100 fine tuning for that lens at much too close and that is perhaps why. And I think that is one of the drawbacks to keep in mind with odler lenses, focus may not be quite as good as AFS and also one might get some more chromatic abberation because it doesn't have the most advanced coatings like the current generation. As with everything plusses and minuses I guess.
One thing about the used/less expensive appraoch is that it does let you build over time as you find "gaps" you want to fill or perhaps "specialty" lenses. F.e. I love love love the 85mm 1.4 but can't find it used for less than 1200. So I bought the 105 f2 DC for a fraction of the cost and it gives very close to the same dramatic bokeh images (some would say better images, but I still prefer the 85 1.4 slightly which is just personal preference). One thing though that some may not believe is that I have tried both extensively and on my camera the screw drive 105 DC grabs focus very quickly (not lightning quick like the 70-200 VRII, but really quick) vs the 85 hunts a lot when wide open and it's really annoying. And I actually love hearing the 105 focus. Sort of like driving a stick shift vs. automatic, I feel more involved in the process I guess.