I have an AppleTV and a Dune Base 3.0.
The AppleTV is a pretty solid unit for audio. It integrates properly with iTunes, but is a headache with the requirement to keep your PC on all the time to serve up the iTunes library constantly, with the added headache of iTunes.
The Dune, with Zappati, is top shelf once it is configured for DVD/video playback. Since you seem to be after a music manager, I would have to say that it doesn't support music in almost any decent manner and is downright lousy. But, that's not why I bought it. I will likely end up with about 450-500 movies on it, this year, spanning 8TB or more.