The Zu Pivot is a good cable. Big, big improvement over a Radio Shack I had or the readily available Monster (though it was significantly better than the RS and cheap at $20). The Zu is good value, especially if you get it on auction at ebay. Clearer, more open, better highs. I'm now experimenting with a Bis Audio cable with copper Eichmann RCAs that they made up for me and am even happier. Vinnie at Red Wine Audio likes the Audiopath cable -- silver with silver Eichmann and the guys at 6moons like the Crystal Cable. Try 'em all and let us know!
btw use Apple Lossless on your iPod.