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With a budget of $400 I'd look at the 2600X. 6 cores/12 threads vs your 4 core/4 thread, about 20% faster per core, and costs $240. Motherboard wise look at one with a B450 or X470 chipset, the ASRock X470 Master SLI/AC is a Newegg exclusive and costs $140, not a bad price for what you get with an X470 motherboard.
Though it blows your budget, you still might want to look at the 2700X, you get two more cores and slightly faster clock speeds, and if you're going to be doing heavy multitasking like you say, that extra $90 is a worthy investment at $330, and you're only $70 above your $400 budget with that motherboard.
I actually was looking most at the 2700x, my max cap limit is 400$ for a CPU, and about 800 for motherboard and RAM. Thank you, was a bit stuck on the 2600, it seemed very promising. Also major thanks for suggesting the AsRock X470 motherboard, looks a lot more better suited than the one I had in mind.