How important is powercord synergy?

Powercord is important depending on length and current it needs to drow from the wall socket. If you intend to use a long powercord you should take a thicker gauge

If you take care of what's inside the wall and wall sockets you may find little-to no differences with properly selected powercords.

A power conditioner is great if you have enough voltage i.e. 120..122V and assume a loss of voltage in conditioner by a couple of volts.
Amps are OK if input voltage is a-bit higher but "hate" lack of voltage and bring an unpleasant distortions.
So I'd rather think of PC later than sooner before certain things are taken care prior and maybe you won't need it after all.

Mootsdude,

I know well of design of Quicksilvers you're about to get. The AC issues are all taken care of inside the unit and less-likely you will gain something going through the powercord game.

You're about to get the unit of one of the finest quality manufactured nowdays so worry less and it's OK with stock powercord unless you need to run larger distances thus you need to increase the gauge.

The stock cord 14AWG can be replaced with Digikey 10AWG dedicated audio powercord that costs a small fraction of all after-market audiophile ones but offers absolutely the same level of performance.