I currently have a V1, D7000, D600, and D800. For my use the D600 is better than the D7000 in every way.
You will be giving up the reach of the crop sensor and taking a beating on the sale price.
No the crop image of the D600 will not be better than the D7000 with the same DX lens. However, a D600 image cropped to the same size as the D7000 when both are taken with an FX lens will be better (probably not noticeable though).