Speaker Cable for SET amplfiier - 1000$

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.

I had an Audio Note 300b and Lowther Horn set up for a while. It sounded the best when I rewired and ran my horns with DNM Precision Speaker wire. Very inexpensive as compaired to other brands. Depending on length needed you should easily get by for under $300.00. With plenty left over to buy music :-).
Good-luck,
Rodge
http://www.simplifiaudio.com/complete_systems/dnm/cables.html