Agree with @ghdprentice. I own a Niagara 7000 and tried several manufacturers power cords and the AQ Dragon was easily the best. Saying that I didn’t try say an Odin cord or ones that are stratospherically expensive. With the 5000, I would start at the Hurricane and see how you like it, but certainly try other brands to see what you like. Nordost has always sounded thin to me and Shunyata is excellent too but maybe less open and dynamic compared to AQ cables. A great ‘value’ and great sounding cords are the upper level Cardas cables.
I think AQ gets a lot of flack from internet fodder because of the scientific claims they make (which may be true), but their equipment has always sounded great to me.
Cheers!