Speaker Cable for SET amplfiier - 1000$

You'll have to buy pre-owned but there are plenty of amazing cables for under $1000.

Ignore the amateurs.

Contact Steve at Decware to discuss. He makes SET amps, speakers, and speaker cables for his SET amps.

You may spend less than you've targeted but I've really been amazed at my Virtue Audio and LAT cables. I don't think you need or want to buy silver cables (silver prices are insanely high right now) and I would think they'd sound terrific with your system. I have a Jolida tube amp in the bedroom running a pair of single driver speakers and the Virtues sound remarkable. The LATs are terrific as well.

You can spend a lot more but I'm not sure it is a Pareto Optimal allocation of your funds.

Virtue Audio makes a remarkable amplifier. Its insane with Onda speaker cables. The Onda company will be in the Von Schweikert room at CES.

High efficiency speakers + low power amps + reasonable price = VH Audio speaker cables. The ultra low inductance is what you're looking for and will have the most audible effect.