According to your profile, four of your seven lenses are DX lenses which are pretty useless on the D700 which is a FX camera. I believe you have to decide whether to stay with the DX system or switch to FX lenses and cameras. My last DX body was the D200, and I got a D700 five years ago. The D700 is an excellent camera, and I still use it with my f/2.8 zoom lenses. Only with first rate prime lenses do I see a significant IQ difference between D700 and D800 files.