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Depending upon the age of those Sigma lenses, some of them may require FW updates, from Sigma, or, may not be update-able. You may want to contact Sigma customer service, to see about this, before you base any camera-buying decisions upon being compatible with the lenses. Nikon’s AF system changed so much, in 2016, I would be especially concerned about older third-party lenses being OK with post-2015 cameras.
Even a D300/D300s would be a noticeable upgrade, over the D200, according to my wife, who used employer-issued D200, D300, and D300s cameras at work. It was a D300s that caused her to become a dedicated Nikon DSLR shooter. She still uses a personally-owned D300s, sometimes, by choice, even though she has a D850 and two D500 cameras.
My APS-C system was/is Canon, and my path with Nikon DSLRs was D700, D3s, and then the big leap to D5/D850, so I cannot offer experience-based advice on the D750 or D7500.
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