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I really think you'll be good with a Ryzen 2700x system based on your use-case... But if you say money isn't a huge issue, the 9900k will somewhat offer you the best of both worlds in terms of single core and multi-threaded performance in general. 8 cores 16 threads is nothing to scoff at, and the higher IPC/clock speed on Intel does handily beat out Ryzen, but the cost difference is quite a lot..
Coming from the i5 750, you'll see a massive jump.
Also, AMD is so threatened by the 9900k they're going to launch with 12 core Zen 2. With it's expected 20% faster performance, that will just barely match your 9900k in productivity. We will see if they can actually price it lower.
I expect you'll get at least five years out of the 9900k, if not more. And you can buy it today, instead of six months down the road.
So this will be my setup: