Aftermarket cords do not necessarily produce better sound than OEM, which is strong evidence of their utter system and component dependency. Do you think your amp would be able to take advantage of the more expensive cable, assuming the quality of sound it can provide is simply increased, compared to the opportunity cost of other upgrades? How much do reviews of cords w/ non-Jolida amps tell you? The easiest way is to experiment yourself. There is buy/sell used, and fatwyre.com :
http://www.fatwyre.com/how2.html#Evaluate
http://www.fatwyre.com/how2.html#Evaluate