Power cable recs for Topping D90LE DAC

For that DAC I wouldn’t do anything more than something like a Pine Tree Audio Iso-Braid that’s $105 for 6 feet…

https://sites.google.com/view/pine-tree-audio/power-cables

I would think Cardas would be your best bet. You have Cardas as your interconnects. I assume you have chosen a power cord for your amp? That will make the biggest difference. 

Audience makes the F3 power cable.  I bought b stock. Very affordable and if it doesn’t work out on the DAC, their good on power amps and subwoofers.

I've always liked Audience for digital..the F3 is a great value, usually easy to find at about $120 ...