Moving from DX to FX: Which DX lenses did you keep?

If the rumored D600 releases next month at the rumored price, and/or the D700 drops further, I am seriously considering upgrading my D5100 to FX. My main reason for waiting to go FF again (I used to shoot with a 5D and primes) is being able to shoot closer for shallower DOF (85 1.8G and 50 1.8G are high on the list).

However, for lightweight, affordable zooms I feel DX has an advantage. I don't see any FX alternatives to my Sigma 10-20mm f/4-5.6 or the 17-50mm f/2.8 OS that aren't significantly heavier/bigger, more expensive, lacking stabilization and/or worse in the corners. For walkaround use I might be inclined to keep the DX lenses.

Just curious what DX lenses FX shooters are keeping.