Hi,
It seems that you are really instructed on ipod technical data. Since i do have a 2009 iPod Classic 160Gb and an iPhone 3GS i'd love to know what audio chips they do mount. Personally i think the iPhone 3GS headphone out is a wonder of engineering an the Classic sound not being that deep is somewhat similar. Very good stuff for listening music on the go (if paired with good IEM's).
I read somewhere that the latest iPods mount Samsung chips.