Need a good biwire cable pair for b&w 802 d3 speakers?

I have biwire cables but need 2 more feet so I need new cables. Saw k4b biwire cables 13 ft for $82 a pair.

amp used is a Macintosh.  Any ideas?
A C note, to 20k

Used is gonna be your best friend.. Is that a SS or Valve amp? My valve gear likes good heavy copper, I haven't got a chance to try a 7N copper 12t weave. I bet it's perfect.
SS you might use a good silver clad wire and silver over copper ends or red copper. NO Gold. It will take a while to break in. I love Mac with the right cables. Usually it's a pretty simple construction for them..
GREAT power supply goes a long ways.

Brand? LOL Happy hunting though.

Have Blue Jeans make you a pair of Canare 4S11 bi wire cables for less than $200.00. Nothing else will come close for the quality of sound.  
Suggest staying away from silver conductors. Agree the Canare would be a cable to explore as they have a fairly neutral character and maybe a little laid back. Very nice cable. Just get a single run and use jumpers... not a biwire pair. Needs a couple hundred hours to settle in so don’t get in a hurry.
Couple hundred hrs to settle in cable?? How much canare? Seems biwire still good, no?
A $22K speaker driven by a $82 cable? Dunno, but my little finger tells me that you will do a disservice to your speaker....

In your position, I would go to my nearest audio dealer and ask for a few cable loaners at different price range, and hear the differences. There is no free lunch in audio, where you typically get what you pay for. Just go for the better sound that your wallet can afford. Speaker cables will have a huge impact on your sound. Be careful matching your amp/speaker cables/speakers. It’s all a matter of system tuning and integration.

I own a pair of refurbished Apogee Duetta Signature speakers. I started using them with MIT-330 speaker cables. A year later, bought another pair of MIT-330 and bi-wired my speakers. Huge difference in sound and never looked back. However, bi-wiring is speaker dependent. Contact BW to validate if they favor bi-wiring. They may also suggest you some speaker cable manufacturers that work well with their speakers.
Bad choice, no difference. 
1. McIntosh have an output transformer and low DF (40 or less). so speaker cables do not make a difference.
2. If you look at a Bi-wire or an equivalent full range cable, that has the same cross section, the  full range cable will perform better.
It show up on P-Spice analysis. It also makes sense when you think of how currents flow there.
Bi-Wire was a big sales point in the mid 90's. Forget about it. 
you raise some really good points. Can you clarify pt 1.

for those who believe in cables, what about ‘transparent’ cables.  Seems to be a really good Maine co that offers strong expertise.
$80 speaker cables for those 802 D3?? It does not make any sense. And if you are looking at that price "range", really, does not make any difference. Buy from Amazon or Home Depot