RE the BS around cables, I agree the really expensive stuff is snake oil material, but the really cheap stuff is nasty, not so much in the way they sound but the quality of its manufacture.
I bought really cheap HDMI cables for a 15m runs within the walls and had to re do the whole lot when the cables failed, the "realistic" priced stuff from monoprice for example worked a treat and could handle being pulled and tugged through walls and conduits.
So it worth paying a bit extra if you want the cables to last.