Tomorrow Allen's Camera is advertising a sale on some Nikon products.
Nikon D750 and Nikon grip $1396.95.
Nikon D750, Nikon grip, and Nikon 24-120mm f/4 $1896.95
Nikon D500 and Nikon grip $1796.95
Nikon D500, Nikon grip, and Nikon 16-80mm $2396.95.
Nikon D5600 double zoom kit $796.95.
https://allenscamera.com/
I've never used a 3x00 or 5x00 series but had two D90 bodies as well as my current D7100 and D7200. The D7x00 series operates similarly to your D90 (the command and sub command dials and not so much being menu-driven). The D7200 is great! I don't know if it will be on sale lower than it is right now--looks to be $996.95 in the USA at the moment. I got mine new on sale in May for $796.95.
The D7500 is the newest in the DX lineup, but Nikon took away some of the important features such as dual card slots. There are other downgraded differences, too. BUT the D7500 shares the same sensor as the D500. And that is one awesome sensor. I'm not sure about the differences in which lenses it can use, but there is a lens compatibility chart online that would offer more help there.
See what tomorrow brings with the sale. Maybe there will be more Nikon gear on sale. Otherwise, quite often Nikon runs sales for the holiday.