I am certainly an advocate of the new 85mm f/1.8G. One of the best bangs for the bucks Nikon has to offer.
As to going from a D7000 to a D700...this is almost a sideways shift. The problem comes in the enormous cash outlay for all the glass...I think instead I might get either the 85mm or possibly the 105mm or 135mm f/2.0 as this would be good for concerts and the local scene. The ISO is the same for the D700 and D7000 so the advantage of the crop sensor is one can use a 135mm f/2 on the D7000 and have the same image size as the 200mm f/2.0 on the D700....only a savings of about $4600!
But if you have that kind of money, well, it just keeps going on and on and on.....
Keep your D7000, grab some new glass, and show us some photos on PAD...