I would recommend Z50II. I expect there will be an improvement in AF over the D7200, which is the main thing you seem concerned about. I am not sure you will find better AF than the Z50II unless you spring for the z8 (or z9, which is presumably out of the question). Other than AF, one of the main reasons to go Z is for the lenses, all of which seem to be better than their F mount equivalents. Sticking to the Z50II releases some of your budget for lenses, and you can always move to a FF Z camera at some future date. Unfortunately, there is currently no Z equivalent to the F mount 70-300. The nearest is the 100-400Z, but this is significantly bigger, heavier, and more expensive. You can adapt your F mount lens and wait. People are also saying that the 28-400Z is surprisingly good. Conservative approaches might be Z50II + 18-140Z -+ 70-300F adapted, or Z50II + 16-50Z (or 12-28Z) and 28-400Z, and add more once you get a better idea what direction you want to go.
Of course you can get a z8 and that will be a professional level tool, but then what lenses will you use? Z8 + 24-120 will be great but will take up much of your budget.
Of course you can get a z8 and that will be a professional level tool, but then what lenses will you use? Z8 + 24-120 will be great but will take up much of your budget.
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