Recommendation for new PC hardware specs?

Right now you're looking at a new CPU, a new motherboard, a new GPU and possibly new RAM and new disk(s), preferably m.2 PCIe SSDs. If you're running older SATA SSDs or (worse) mechanical spinning HDDs, and do not have anything faster for storage, then you will need to factor the cost of new drives into your budget.

And if your old RAM is rated to run at only DDR4-2400 or slower, then you will need all-new RAM as well.

That said, newer GPUs are all in very short supply, and are far more expensive than what they are supposed to be priced at. The only reasonably available and affordable GPUs that are in stock right now are very-low-end GPUs that are not sufficient enough of a performance improvement over the integrated graphics inside a newer Intel CPU to justify their current street prices, and are so old that they are either obsolete (no new driver releases will ever be released for these GPUs while the last released driver is already now years old) or are about to be moved into "legacy" support status (no new driver features and only critical security fixes).

This includes 2 recommendation links from Puget Systems... copied from Peru Bob
https://community.adobe.com/t5/video-hardware/premiere-pro-hardware-articles-to-read-before-you-buy-or-build/m-p/11557686

Now is not the time to build a new computer because of the semiconductor shortage. GPUs are expensive. Having said that I would wait to see how Intel's new Alder Lake CPU will compare to the chips from AMD. I favor the Intel chips over AMD CPUs because of Intel's Quick Sync but Quick Sync will not be a benefit for everyone. I favor Nvidia over AMD for the GPU because of Nvnec but  AMD GPUs do have something like Nvenc for H.264/265 encoding and decoding. Last but not least 64 GB of RAM might be the right amount for your needs. 

On a side note I don't doubt Adobe has a few Alder Lake CPUs and a Windows 11 beta. It would be awesome to see some benchmarks.   

Here's the adobe forum specifically for hardware:

https://community.adobe.com/t5/video-hardware/bd-p/video-hardware?page=1&sort=latest_replies&filter=all