Two observations:
1. For a portable unit, I second Wyatt's mini Jambox. Solid battery life, doesn't weigh a ton, puts out decent sound, acts as an excellent speaker phone for conference calls, Skype or face-time. DURABLE! Like the color options, but the other stuff makes it a good buy, IMO.
2. We have a Sonos system at the brewery. LOVE that you can break up the space into zones and have different music going simultaneously. You can run the system right off your phone and choose from Spotify, Pandora, TuneIn or your own music library. We use our own speakers that are wired. Lots of options with a setup like that in your house.