Nicholas, it looks like your original nad ipod dock doesnt bypass the dac in the ipod. If you get a dock that bypasses the ipod doc, and hook it up to a good external dac and stream mog or spotify premium, you'll be happy imho. I bought pandora one at the same time as spotify premium and hardly ever use pandora one because spotify sounds better (very close to cd's ran through an external dac). You could get an ipod dock, like the one mentined above and get a good external dac, pay for a mog or spotify premium subscription, and you'd get better sound than you have now, again, imho :-)
Good luck!!
Good luck!!