I agree having music streamed is the easiest way to enjoy your full catalog of tunes at will. I haven't made the leap to AppleTV just have one iMac and several iPods in the house and the few times I have tried to use my Mac or an iPod as the source the music sound quality was very good, all my music is ripped at 320k and downloads are at 256. I do most of my music streaming via my NAS / Denon3808 and I have my music ripped to FLAC.
Yeah I have a doc for my Pioneer Elite but the menu system is terrible. So the ATV is a great improvement in that regard. The only issue I found is that my computer must be on for it to work and be on the right network. I have both a vpn and regular network and switch my computer back and forth depending on the application. So far I am impressed with streamed ATV sound quality.
