I would assume you are doing this undertaking to make sure that power is not a limiting factor in sound quality. Before you spend all these money, lets look at what and why. Given that otherwise power quality is acceptable (no EMI, etc.), the main limiting factor from AC power would be too high of output impedance, i.e. sagging even for a shortest time under changing load. A valid concern, since this introduces nonlinearity, intermodulation distortion, and reduction of dynamic range. But the current rating of your incoming power and details of your distribution panel are not the main bottleneck in the entire power budget. The in-wall wiring and all the old twist-on connections are. Unless you recently upgraded your wiring and know exactly what it is, my guess is that likely you have AWG12 solid wire connection at best, or even thinner wire. NEMA requires AWG14 for 15A branches and AWG12 for 20A branches With long runs and likely several twist-on connections with possible oxidized copper you may not see much actual difference once you are done with the upgrade you've mentioned.
If the situation with wiring is what I described, you would better off using a good quality power conditioner that would compensate for the deficiencies of old wiring. To toot my own horn, my company makes EMI filters for industrial applications with very low output impedance that compensates for some problems in wiring, as well it gets rid of EMI just about completely:
https://www.onfilter.com/ac-power-line-emi-filters
