I'm adding Jupper cables and your opinion is ??

I have sort of given up on buying bi-wire speaker cables. I believe there is a sonic benefit to bi-wiring with some speakers, but to maximize the benefit you need to run the bi-wire pair separated from each other. Therefore, I ultimately prefer two single runs of the same cable. Another advantage is that you can try a single run of the wire first, and then decide whether you really like it before adding another single run when you can afford it. Purist actually doubles their wire on their bi-wire cables, which is good, but the cables are in the same jacket. This was a long way of saying buy the single run, try the jumpers and then decide later whether you want to add another single run. BTW, you can easily make your own jumpers using hook-up wire (partsconnexion has everything 20% off through the month), or even short runs of a manufacturer's speaker cable if you can get it. Try twisting up four wires of 20awg PCOCC copper (don't go less than 6-8 inches), and terminate with spades, bananas or one of each.

When you consider just inside of the binding post is whatever type of hookup wire the speaker designer chose to utilize, it is harder to imagine a 6 to 8 inch jumper wire making a huge difference as long as the gauge is adequate. Al is correct, there is a whole bunch of info available here on bi-wiring. Based on your statement regarding a double run, "a price tag of the cable that I'm looking at of about $16,000," I assume the cables you are considering are about $8K per pair. At that level, and considering the quality of your Avalon's, I would probably obtain a pair of the cable manufacturer's own jumpers to be sure you are achieving everything you should be sonically.