Another nikonians member put together a great
interactive chart showing dr for various cams.
click on d600, d600-dx and d7000 on the right side
and clear any others that may pop up by default.
That and it's my opinion.
My only dx lenses are nikon 35 1.8 and tokina 35 2.8.
Both work in fx mode with vignetting that is easily
cropped in post and larger than resulting pic taken
in dx mode on the d600.