For Analogue,...GOOD quality does matter VERY very much! NEVER buy cheap quality/priced cables for analogue,....u will 101% feel the difference,particularly if there are lot of electric interference nearby as in a AV-T setup, u will end up in distorted & bad qulity video & audio too.My premium quality/priced Monster cables does FULL HD 1080p video & even 1080p 3d sbs over component analogue exceedingly well/flawless ,...for the matter,i don't even find the slightest difference in video quality over my digital/HDMI or analogue/component connection on my big 51" pdp !
For HDMI, i honestly don't find much difference of video over my many different quality/priced HDMI cables...video appears fairly consistent on all of them.