I wondered the same thing whenI had my LS50W’s and my dynaudio xeo’s...
I never got around to it but I’ve got to think that upgrading the powercords on the kefs will make a nice improvement. As to what Douglas was saying, that makes total sense. However, “all” of the cords for the LS50W 2 are the 2 power cords.
I say upgrade them right out of the gate. You’re lucking out with the fact that by upgrading 2 power cords, you’r upgrading powercords for the dac, preamp, and multiple amllifiers. With that in mind, it should make a nice change!
I’d take into consideration the lengths, the gauge, the flexibility of the cord (pangea ac 9 would be out,for example) and the sound signature.
I really like Cullen Crossover series because they are very open and detailed sounding. The crossover series is a nice thin gauge too (12 gauge?) so its not hugely unwieldy. The wire is a bit stiff though but once you have it in place, nk big deal. Power cords do sound harsh for a few days after you bend them all up though, so be prepared for that. Analysis plus power ovals for $130 are a great option as well.
If I were you, I’d already have my 2 upgraded power cords all ready even before you get the speakers. Use the upgraded cords right out of the gate and burn the powercords in as you are burning the speakers in. The first genLS50W sounded much better after 3-4 days of continual use. I left mine on overnight at low volumes playing classical music. I’ve had experience with 4 pairs and they were all a bit aggressive right out of the box.
Upgraded powercords, some nice non resonant stands at the right height (usually 28”-32” for LS50’s) and a REL T7i (Or 2 or more) and you’re in business!
I’d also upgrade your outlets. Cullen Cables has pass and seymours for $10 or Albert Porter (check out his rig here on audiogon!) has cyro’d medical grade outlets for $50. Those are called porter ports. They’re worth every penny!
Anyhow, enjoy your new LS50’s! They are just awesome little speakers and the new metas are supposed to be better so you Sir, are in for a treat!