Can upgraded power cords help my setup?

You may find that just decent audio powercords which don't have to be costly will work well with a switching power supply.

I found expensive or good cords don't seem to work to the advantage in the switching supplies and not as critical as when used with linears supplies.

I have found the lower price Transparent and older Audience to be good value power cords

@justubes2.... I find your comment about PC's with switching power supplies interesting, Not really something I had considered. I've been on the fence for quite a few months, as to whether or not I should upgrade my PC's? My main reason for considering this is that the IEC connector on my somewhat high end DAC/Pre, does not make a snug connection. I'm a firm believer that any positive improvements made by PC's, are solely based on the quality of the connection, gauge and shielding, nothing more. My amp does have a switching power supply, so I'll will have to look into this more.

@asahitoro - the Node-2 responds very well to good cables -  IC's and PC's.

I used a C7 figure-8 adapter, but eliminating the adapter and installing a Figure-8 plug  proved to be much better
- I bought a figure-8 plug on the web

Some very good PC's are made by KLE Innovatons - contact them to see which ones would be best for your system

Otherwise - Signal Cables are very good value

It really depends on your budget?

regards - Steve

@chewie70 - don't forget about cable geometry. That plays a part in the performance and 'sound' of a cable as well. Even power cables.