Woodworker,
My perspective is that for any audio system, you want to get its foundation as good as possible. To me, that means getting the room acoustics as good as possible, the speaker setup within the room as good as possible and getting the electrical power as good as possible. Once you have these done right, then you can work on items like vibration control (racks), etc. So, bottom line, if you can improve the quality of your electricity that is what I would do first.
Arnie