To keep cost low and evaluate the difference in cable try building your own... it takes time and patience but done right (hard to screw up, but easy to fix if you do) you'll end up with a really nice pair of speaker cables and you'll learn along the way.
The recipe on this link set me up with nice sound for little money... http://members.nbci.com/_XMCM/rjmaudio/spk.html
You can also check out...
http://www.tnt-audio.com/clinica/tweaks.html
caveat here is that the text is translated from Italian so sometimes the picture the writer paints may not make much sense, but he does go into more detail than the first site.
The recipe on this link set me up with nice sound for little money... http://members.nbci.com/_XMCM/rjmaudio/spk.html
You can also check out...
http://www.tnt-audio.com/clinica/tweaks.html
caveat here is that the text is translated from Italian so sometimes the picture the writer paints may not make much sense, but he does go into more detail than the first site.