I would not overthink things. You have received two recommendations for Canare 4S11, which is an optimal (star quad) geometry for speaker cables made with suitable copper and relatively inexpensive. One of those recommendations was made by a successful speaker manufacturer. You can buy the bulk cable dirt cheap and terminate it yourself by crimping on $2 ea. solid copper Vampire spades from Partsconnexion, or you can pay someone like Blue Jeans Cable to terminate it for you at a somewhat higher price.
The only reason I might consider something other than the Canare, in your situation, is that I tend to prefer solid core cables. My typical low cost recommendation is Audioquest Type 4, which is two solid conductors at 17awg and two at 20awg. Connect a 17 and a 20awg wire in a star-quad configuration (connect the wires diagonally across from each other together for each pole-pos and neg) and you would have just less than 15awg total aggregate area for each pole. This may not provide as full a sound on the 12 foot run. Other solid core options include AudioQuest Type 8, which is larger (I believe 12awg) and can be economically purchased and terminated by Audio Advisor, or the previously mentioned AntiCables, which many enjoy.
Personally, if I were you, I would either build a pair using the Canare cables (connect the two diagonal wires for each pole) or the AQ Type 4, or I would purchase the AntiCables. You may want to consider keeping the difference in cables no greater than 50 percent of the longest cable run.
If you are concerned with the gauge of the AQ Type 4, one thing you could consider is running two full cables to your LF binding posts (one full run each for pos and neg), which would result in almost 12awg to the LF driver, then a single run to the HF posts, configured as a star-quad, as discussed above, for 15awg. I suspect that would sound great. You can purchase the Type 4 cable in bulk and crimp on your own spades. A small amount of heat shrink applied with a hair dryer and you would be all set.
