my 2 cents (consistent with some comments already made...)
lots of decent copper stranded cable out there, branded or unbranded, just get right gauge, terminate well, make tight connections - solid core copper maybe a touch more lively but once again not a difference worth chasing for most
of course if just for curiosity, just want to tinker and try for fun, then have at it... make yourself happy
many options out there all work fine, many makers/sources named already, i would throw in belden 9497... differences are non existent to very very subtle unless one has an exceptionally high resolution system, even then, changing speakers, source, or even interconnects will most likely make more of a difference sonically
it is very hard to do quick a/b of speaker cable... (the ava abx comparator does allow this)... once you set up for controlled a/b, better blinded, it is really hard to reliably tell the difference
above all else, i would say, just enjoy the music...