I have Sonos throughtout the house and I recommend it heartily, It has the ability to play songs on your iphone or android phone, play internet stations, play Sirius (with subscription), can be controlled by your phone and can be networked and expanded at a later date using more Sonos devices and zones. And everything is wireless!
I think a Play 3
http://www.sonos.com/shop/products/play3 fits your requirements.