I'm thinking of buying an iPod Classic but noticed many reviewers criticizing the audio quality. I have a 4g iPod that I use in my car through a doc to aux cable so I'm not worried about headphone jack quality. Would the bad sound quality described also remain if connected through the doc? or is that only a headphone jack problem? I'm very happy with my 4g iPod sound quality but the hard drive is on it's way out. thanks for any help!