Should I trade my nikon d800 in for the new d850?

Should I trade my nikon d800 in for the new d850?

Read more: Should I trade my nikon d800 in for the new d850?

What should I upgrade to from a Nikon D7200?

I have a Nikon D7200, a 50mm f/1.8G, a 18-140mm f/3.5-5.6 and a sigma 18-35mm f/1.8. I'm planning to get a new camera(and maybe a lens or two if needed) as an upgrade to this one but I'm confused to which I should get. I really like the new mirrorless cameras coming out like the Sony a7III, Nikon Z6 and the Fujifilm XT-3(or if any other choice is better). I need a recommendation on what to get with a budget of $3500. I also don't want to sell off my D7200( though if it is more beneficial you can say so(I'm currently living in the Netherlands, so keep that market in mind if that is the case))
Things I want are:
1. AF better or on par with my D7200(better especially in video)
2. Good lens support
3. Good 4k video
4. Less weight than before( so that I can take it on a vacation or something)
5. Good EVF (I've never used one though)
6. Good battery life or batteries being cheap
7. Sensor stabilization(I don't have anything other than a tripod)
8. I might do some vlogging
9. I'm a casual photographer doing jobs on the side(though that s rare). Mostly for myself and friends and family.
10. I'm not sure about eye-AF though I did hear it's great.
11. I'm very nit picky though on pictures and video though
12. Maybe some accessories
13. I could do some astrophotography and time-lapses
14. I could jump into professional work but am not sure at the time
Anyways, thanks for reading through all that

Read more: https://nikonmag.com/talk/what-should-i-upgrade-to-from-a-nikon-d7200.html

Where is the best place to buy a Nikon D7500 for sub-$800? (check desc too)?

I'm looking for one sub-$800, but $800-$820 is good too.

Read more: Where is the best place to buy a Nikon D7500 for sub-$800? (check desc too)?