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"RE: D600 - should i trade my DX lenses and my D300?"
If you are going FX, then your DX lenses will be of little to no use to you.As you rightly say, you can crop in post to achieve the extra "reach" that many say DX delivers.I have kept hold of my sigma 10-20 for the time being as I quite like the vignette that it shows up if I force it to shoot in FX - I suspect it will be replaced soon though!