Should I move from DX (D90) to full frame?

actually what you do realize when you go from DX to FX is that sometimes you want the extra DOF of the smaller sensors - especially noticeable at longer FLs ... where DOF gets so thin it's hard to place ...

in some circumstances my little LX5 is the thing to use just because nearly everything is in focus all the time even at  f 2.0

I have two FF bodies right now - actually think my next body will be DX - D400 ??