All depends on timing I guess. Budget permitting, grab whatever you can get yours hand on if you need a new system now. RTX3070, RTX3080, Radeon RX6800, Radeon RX6800XT. (stay away from the RTX3090 though, way too expensive for what you get). They’re all in pretty short supply right now.
If you’re not in a hurry (and we’re talking about a couple of months here), you can dive deeper and watch more review/benchmarkt to see what fits your needs most. And whatever you do, don’t pay scalper prices.
If you need something right now, you can also look into a 2000 series NVidia card, or maybe a Radeon 5700XT. Just compare their prices to the newer offerings, and don’t get carried away.
I’m running a Ryzen 5 3600 CPU with a Radeon RX5700XT right now. It’s not amazing compared to the new releases, but I can run the game quite well on 1440P (mix of high and ultra settings), so there’s really no need to break the bank right now. Might grab an upgrade myself in the future though, mostly for VR (more around the 4K realm), but in reality, my current system runs the sim just fine, so don’t overspend if your budget is limited.