I was referring to 3k budget for a camera body. I can get lenses as I go along and use my old D5200 or the even older D40 I have until I have lenses for the new camera. Then sell the older camera's to help replace the funds that were used for the new camera.
If that would be the situation i'd suggest considering reversing the order. If you picked up your FX lens(es) first you could use them on your current bodies and enjoy the investment instantly rather than having a full frame body sitting around gathering dust waiting for the full frame glass.