3 speaker cable options - what to choose?

As I said, anplificataion is not going to be replaced soon, I am actually quite happy with the current setup, and feel that a minor tweak is due.
Since the SC are the weakest link I thought to upgrade them.
The question remains: under the current setup, which of the alternatives will yield the greatest improvement?
It's hard to convince myself that these tiny Clearday shitguns will deliver with my inefficient speakers, yet they are highly praised here in audiogon.
The Audio Art seem more conventional cables, but I have never got a chance to try them out either.
Then there are the morrows, with their endless levels, thus leaving me confused...

You don't have to convince your self, says clearly on Clear Day website you need Double Shotgun for your speakers.
I personally confirmed this with owner , a stand-up guy, before I bought my Doubles, as my speakers are in same range as yours.
You hardy ever do get to hear cables, wouldn't much matter
if you did unless it was in your system and in your room.

I never heard speakers that didn't sound at least good with SC-5 or 5E . After break in of course.

I've owned the Morrow SP-3s and SP-5s biwired and there is little difference in sound between them. They are both nice. I'd always returned to Speltz Anticables because they sound more transparent and live. I believe the Morrow cables are an ingenious attempt to get the buyer to constantly upgrade in the belief that the more expensive version is better--not worth the price difference if you have to go back and forth to even hear one. The SCs I bought were all broken in and used in systems for over a year and by me 24/7 for a 2 week period prior to any listening as a break in after puting them into my system. When I tried MG Audio Planus III copper ribbon SCs, my quest for better sounding SCs ended and the others were sold. Seriously transforming sound and the price was worth it--much more than your looking at though. Can't vouch for the other two cable companies but I'd bet on the Anticables over either. It wouldn't be night and day difference most likely, but the Anti's are very transparent and live sounding in the lower cost category. I liked them way more than the Harnomic Technology Pro 9+ hose sized cables that cost $1499 new. They only lasted a couple weeks before I returned to the Anticables and the joy of listening returned.

In many systems anti-cables sound terrible, in others they sound good.
I agree upgrades are part of Morrow business plan as it is
with almost every cable company.
I use Morrow SP-3 and SP-4 biwires, SP-4 is a little better but on rock music I doubt if you'd hear the difference . On acoustic music you can.
AudioArt makes SC-5 and Sc-5E period .

"02-15-14: Behemot
Electronics will be replaced later this year, not now. This a different scale of budget we're talking about. Currently I want to finalize the SC upgrade."

I don't think I get what you are trying to do. How can you finalize your speaker cable upgrade before you have your new electronics in place?