I have a 51" rear projection Sony Wega TV. I think this TV has a pretty good picture for a non-HD TV, however im pretty sure that it does have component cables in the back. Thus far, I have only ever used the standard composite cables. My question is, how much of a difference would i see in picture if i switched to component cables? will i only see a big change with an HD TV? I'm just wondering if its worth the extra money down the line.