i tried several ipod doc before getting the wadia. compared to docs that use the dac in the ipod....the wadia is light years ahead...seriously. there really is no comparison.
no doubt you'll get similar results from other doc's that bypass the ipod dac. getting away from the ipod dac is the silver bullet regardless of how you get it done.
if you're not using an external dac?? all bets are off. it'll sound very sub-par regardless of the doc you choose.
btw....i just sold my wadia and went the streaming route.