I'm vacillating on the Ryzen 3000-series CPU lineup. IF I choose to upgrade, I DO want a 16C/32T. If I'm going to spend the money to upgrade, I want to go as all-out as possible, within the platform's limits.
I'd like an X570 board, but they sure look pricey. If my current board (Gigabyte B450 AORUS PRO WIFI) can take the 16C/32T Ryzen 3000-series, then I'll probably stick with this board. It is nice, and not horribly expensive. ($110 on sale, has Intel LAN and Intel AC wifi+BT).
I would not trust that board to the 16c. Actually I would not trust any B450. You can try it, and it would be kinda interesting to watch, but still.
That board is a 4+3 with extra inductors (making it look like an 8+3). If you want some idea of how that would stack up against an 16c chip, treat it as though it were a 2-phase motherboard with extra inductors for the purpose of running an 8c chip. If you are comfortable with the idea of running an 8c Ryzen on a 2-phase motherboard, hey, be my guest.
If you want to go "cheap" on the 16c, you could try one of the better X470 boards, maybe. X470 Taichi or Crosshair VII Hero. We have seen some people run 8c Ryzen chips on 4+2 configs, so I could see 16c running on 10+2 (60a) or 12+4 (40a).
I used to be more budget-oriented, doing what I could with the mid-grade or in my even earlier years, mostly low-end parts. Now, I want something good that will last a while. (That said, there's really nothing wrong with my Ryzen R5 1600 CPUs either, but I want more graphs showing up under Task Manager, CPU.)
If you really want to go all-out on motherboard, check out the X570 Aorus Master. I think Asus may still wind up with better UEFI/microcode support, but Gigabyte looks prepared to win on hardware. The Master and Extreme have an amazing VRM.
After that point it's all about your PSU, dGPU, RAM, etc. You know the drill. I'm guessing 850W platinum power supply, 2080Ti, and one of those new PCIe 4 NVMe drives for you. Not sure on RAM since we don't know if Matisse can handle 2x16GB configs correctly yet (unlike earlier Ryzen chips).