Hello Tim,
I was waiting for some of the other folks to offer their opinions before I butted in
My personal thoughts are that, in your system, I would suggest thst you upgrade the speaker cables first. Then maybe add the jumpers.
Next up would be the digital cable and the audio interconnects from the source to the preamp.
Finally I would suggest the cables from the preamp to the amp.
I have heard the biggest differences with speaker cables with VMPS speakers. Then I suggest the source end of things.
Then you can start thinking about AC cables
I hope this helps.