Given the high quality of your components I would recommend either Transparent or high level Cardas. Nordost must be high in their levels… so those will cost you… I don’t find lower level Nordost that good.
Definitely an AudioQuest Hurricane or Dragon power cord for your amp. This could easily be the biggest difference you hear.
Definitely try these… the differences will likely be subtitle but very important. The Cardas even at the highest level will be slightly warm… this could add a touch of musicality your system needs or not. Take your time. I’m retired as well. It took me well over a year to slowly zero in on perfect… positioning, cables, interconnects, and power cords and room treatment… worth every moment. My system sounds sooo. Much better in comparison to how it started it is astonishing. You can see my system under my ID. Put yours there and we could probably be even more helpful.