I sadly sold a mint D3x and a D3, (both excellent machines) when I purchased a LN, D5 with 6500 clicks for $2K. Used D850's still hold a lot of worth but I am surprised the bargain prices on the 36mp and some 24mp cameras.
I'm afraid of the D6xx's. (No interest.) I had a D7100 that spattered oil all over the place. I see a lot of D800's on the Bay' with low actuations and prices. That's my nod.