Forgive me if this was already posted, but here is an excellent review of all the higher end Nikons for night photography. The D600 did quite well. It's a really good read.
David Kingham Photography | Nikon Night Photography Shootout
David Kingham Photography | Nikon Night Photography Shootout
(And at wide apertures there's no dust!) lolIn my opinion the D600 is the best value for the quality. The results were consistently close to that of the D4, for 1/3 of the price it can't be beat.