ESPECIALLY for anything digital, there's basically not even a theoretical benefit to the higher priced cables, let along a noticeable real world one.
for speaker wires, I've personally found more benefit associated to the gauge of wire than the quality. I'd rather use a 'cheap' 12awg wire than a brand name 14awg wire. the only exception to this, is some of the cheap stuff is REALLY stiff, so it's hard to run it in tight places.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC(Enby), PS3, XBOX360, Wii
Control: Harmony One