Avoid Guitar Center's store brand, even though it has a lifetime warranty, you'll spend half a lifetime arguing with them. The hardware ends are total crap. I find that it's worth spending on really good, lifetime guaranteed Mogami or an equivalent. I paid up to $125 for a 20" cable, 20 years ago, and it's still as tight and dependable and quiet as the first day (Monster, no longer around, I guess). But I do this for my living, so I really try to avoid problems. But Stephen's points are sensible. Guitarists, on the other hand...
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop