There's been a fair amount of DX bashing here, mostly from a couple of contributors. I disagree with that, and I shoot both a D500 and a D800. What are the strengths of a DX camera? For one thing, smaller and less expensive lenses that can deliver very good results. No 20mm equivalent? I used a Nikon AF-S NIKKOR 14-20mm f/2.8 for years, which replaced a Tokina 12-24mm f/4, so the focal length argument is in my opinion a canard (though the former wasn't a smaller and less expensive lens; but now I have a Tokina AT-X Pro 14-20mm f/2 that cost me $400).
The D300 was an exceptionally good camera in its day, and I used one for years and skipped getting a D700 in part because as far as I was concerned (and I still believe this), 12 MP is 12 MP regardless of format. When comparing an FX and a DX camera that have the same number of megapixels, pixel density was an advantage back then, as it still is today (e.g., D750 compared to a D7500). The viewfinder on the D300 is not bad either (.94x) and I can barely tell the difference between it and the viewfinders on my D500 (1x) and my D800 (.7x).