Sorry for the late response - I was at work all day.
By "high-end" I mostly just meant "expensive". You don't want to get a cable that has the connector pop off the first time you pull on it, but you don't need to get Monster cables to run a line from your Mac or iPod to a stereo.
Assuming that your speakers take a 3.5mm stereo jack as an input (which I think that I read that they do), then yes - the link that you provided is the right one to get.
As for connecting to your Panasonic stereo, it sounds like your best bet is to connect to the microphone input on the front (unless there are some connections on the back that you didn't mention). If it's an "aging" stereo, then that microphone jack might be a 1/4" jack - in which case you could connect the exact same cable that you linked to, except that you would put on of
these (link is Radio Shack because I didn't see it on monoprice, but you can get them at a lot of places). If the microphone jack is 3.5mm, then you could just use the cable by itself.