What is the best USB cable under $500 for a natural presentation and good detail ?

You may try Zavfino Majestic USB cable and report your findings. My experience with their Interconnects and Power cords was quite astonishing given their asking price and build quality. 

Feel free to contact me as I can make you one for well under $500 that will more than satisfy your sonic desires. If you disagree just send it back. I don’t post like this, but I read your posts often and decided I would like to help.

I had very good results with the Oyaida usb: https://www.thecableco.com/continental5s-usb.html

CARDAS CLEAR

http://www.enjoythemusic.com/magazine/equipment/1214/Wireworld_Platinum_Starlight_DH_Labs_Silver_Sonic_Cardas_Clear_USB_Cable.htm