Your CPU is great and will have the single biggest impact on editing.
Since you don't game, you only need to worry about having the proper video encoding hardware and there's no point in buying the "top of the line" version of any compatible video card because PD won't use any of the extra resources at all.
Take a look at this nVidia
chart and select any of the cards with solid green out into H.265, starting with the GTX1050. Any of those card will be great, and the Turing cards (starting with the GTX1650 Max-Q) will give you the most opportunities, especially if Cyberlink ever utilizes their specific hardware improvements.
I have the RTX 2070 because it was the lowest end RTX card at the time, but now the 2060 is out and costs even less.
In my opinion, there's no need to overthink this. Get the fastest CPU you can afford with the cheapest GPU that supports H.265 encoding and you should be a happy editor.