burkphoto wrote:
If you have a significant number of DX lenses, it would be much less expensive to get a D7200 or D500 body. The D750 choice would require FX lenses.
If you want to *trade* everything and get something else, that opens up your options to full frame, Micro 4/3, or other brands of APS-C cameras (or anything, for that matter!)
Walking away from a D90 and a couple of lenses might be fairly reasonable, depending upon what you can spend. A LOT has happened since the D90 was released.
I have a D-750 and you can shoot in DX or FX Mode If you use a DX lens the camera will AUTO DX.