I have owned Moon equipment. Definitely high end audio cords will definitely improve the sound. It is very likely that a power conditioner will help as well. There are occasional instances of power conditioning has not helped... but they are really infrequent. Alway has made a big difference to my.
On your SIM gear, I recommend warm sounding power cords and interconnects. Thinking Cardas may be the best for you. Simm is not warm at all, and can benefit from Cardas. If you want budget DHLabs, but I really thing you want warm.
For power conditioning I recommend Shunyata and Isotek. As close to top of the line as you can. It will impact all your components except the amp (direct into the wall).
If you can two direct lines will add a very cost effective improvement. One for the power conditioner and components, one for the amp.
Shunyata power cords are good, but in the high end ones not the inexpensive ones.
This video from Shunyata explains why the "last six feet can’t mater" argument is wrong. The question comes up at about 9 minutes and 30 seconds in.