I've never changed my wall socket but I guess I'll give it a try one day.
I'd get a decent power conditioner, Plixir is very good, and then plug your Furman into it, use the Furman like a power extension.
Wall warts are evil excommunicate them.
Plixir or alternative regulated DC power supplies.
I'd buy used power cables until you find a brand that you like. You don't lose money on used cables especially if you buy Cardas etc.
However please understand there are BIG differences between power cables for DACs, Pre-Amps, Power Amps etc.
Power Amps should be plugged directly into the wall socket no power conditioner required.