Upgrading speaker cables...

I am of the ’fancy speaker cables "PROBABLY" will not do much for your setup". camp.
I own well over $65,000 worth of stereo. I use $120 a pair speaker cables.(well, toss in a 4 set of WBT for an added $100 LOL for those curious: Kimber 8TC)
AND I have used just as good eBay MilSpec 12 gauge Teflon silver plated wire. For years.
On the other hand I do own $7,000 worth of IC in five cables.
So I have been around the campfire a long time. And have seen a lot of noise.

The op speakers are retail $2,000 for the pair, 10% of that is $200.
And I would say for someone unsure of what to do, Spending no more than $200. is the goal.
PS how LONG do your speaker cables need to be?

Also, the cable for the low frequency driver can be cheaper than the mids/high one.
I personally would suggest buying a pair of Kimber 4VS for the low driver. And a pair of 4TC for the mid.highs.
You probably can find a 4TC used. Not as likely a 4VS used.
A used 4TC and a new 4VS should be around/under $200.

Even buying basic good wire, oxygen free and just using two pairs of that might also do as well.

@elizabeth - you said 65k on your system but I find it hard to believe you would use a pair $125 speaker cable. Do you do 2 channel audio or is your 65k home theater? I have 15k Magnepans and roughly 25k in components and my cables including interconnects and speaker cable cost 14k. Not including power cords.  It just doesn’t make sense and I’m from the world that if it doesn’t make sense it ain’t true. No disrespect.

Cheers 

I've experimented with numerous cables and have come to the conclusion that ICs can make a huge difference, but properly sized speaker cables not so much, if any. 

YMMV

I Introduced Kimber to one of our local brick and mortar shops back in the 80’s and they still carry them today. I’ve owned both the 4tc and 8tc and good cables but there’s so much better out there and one doesn’t have to spend a lot to hear it. Took in a set of Clear Day Cables double shotguns for them to listen to, which almost every system they have on the floor has 4tc and the Clear Days destroyed them and one of the employees there has gone to Clear Days at home and a couple other employees have pitched Clear Days to many regulars that hang out there who have purchased many from Paul. No one there thought the Kimbers were even close and one person there admitted that cables don’t make a difference... well now he does. Blows my mind a shop pushes something and has bought the product they can’t carry. I really like Kimber and know they have a great product line as I’ve owned and still own some. Someone with a system getting up there of the price of nice luxury car should look into Ray Kimbers better cables, I think.... bet Ray would say the same.

As far as what one should spend on cables based on their system really depends on the quality of components. The OP equipment is fine and no doubt better cables are going to improve their system, but yes do not go out and spend $2,000 plus on a pair of speaker cables. My speaker cables are around 21% of the cost of my speakers, CD player with IC and PC is almost 100% and my player shines with my cables and I believe it would improve with cables costing more than the player. My amp I’m around 33% with IC and PC. Dedicated circuits and receptacles will only help and really required when the cost of a system goes up and becomes more revealing or you get to a point you’re just throwing money out the window.

Well OP you got every answer possible--they won't make a difference, they may make a difference, and they will definitely make a difference. FWIW it is a hobby...spend a little money and see what your ears tell you. No one else posting here is going to live with your system.
BTW I agree with adg101 and akg_ca: better cables with jumpers rather than two sets of lesser cables. YMMV--as you can see from all the different opinions.
Peace
Al