Any Benefit of DX Lenses on the D600?

I know DX lenses aren't optimal for the D600.  I have a D90 right now and I'm looking to upgrade and really was intrigued by the better low-light capability of the D600.  I have a lot of DX lenses (35 1.8, 50 1.8, 85 1.8, 18-105, 70-300, and the Sigma 10-20 and 50-150) and was wondering if there is any D600 advantages that remain or if this is just like shooting with my D90.  If there's not much reason to switch, I'll probably wait to see if there's a successor to the D7000 coming soon.

Thanks for the help.