Well don't trust Monster.com. They do manufacture high quality cables, but it seems to me that they overexagerate the benefits.
http://forum.ecoustics.com/bbs/messages/1/1115.html
The forum above is a site that has a discussion on the different audio cables. I just set up a new entertainment system and had to go through all the damn research. I went with a DVI cable (Monster) from cable box to tv, component from DVD player to TV, optical audio from cable box to receiver and coaxial audio from DVD player to receiver.
For video I am of the opinion that DVI is the best. There was a slight, but definitely noticable difference when I received my DVI cable. In terms of audio, I really can't tell much of a difference. Monster makes great cables, but never buy them retail. My DVI cable was 75% off the list price on e-bay... Monster is a large fan of raping and pillaging the consumer. My other cables were just nice ones from radio-shack and I have not had an issue with them yet. I hope this made some help was of was some use.. if you have questions be sure to ask, and I'll do my best to assist.