Well, I own the D700, D7000 and my venerable D90 and an old FM2 and now just got the D600. I could never sell my DX stuff. There is no way I could part with D90 or D7000...they are faithful friends served my image making well and will still do that when I take them go out for a walk occasionally. They give me the little added reach the D700 and D600 may not do at times and they do travel a little lighter when I don't want to change lenses. So I will say I have the best all worlds; a lot of FX and a lot of DX and can be termed the fully rounded Nikon man!