Thanks, Mceljo. To explain this situation more in detail, because the digital inputs on my preamp are already populated, my connection is through a California Audio Labs Alpha DAC. I'm not really complaining about the sound that I heard using this setup with another iPod; it's just not as good as the CD player. I was simply not enough educated on the subject not to expect that it would.
I use Pandora with this setup also and the sound seems even less acceptable, but in both cases their use is so convenient that I'm willing use them for the bulk of my listening. It's not perfect but is pretty acceptable if I'm not actively scrutinizing detail.
I've recently started using the Apple TV generation one mostly for listening to all music that I've downloaded (?) to its hard drive. This is by far the most straightforward way that I've found so far to organize and play music. Once again, though, the quality seems lacking in the same way as with the ipod choices.
The bottom line is that I'm very happy with these technologies and will continue using them without complaint.