We bought a Zeppelin a couple of years ago. The guy in the audio shop was full of praise for the Zep & rCube, but recommended that we wait for stock of the rCube (long story, but it wasn’t possible). It’s the none-airplay B&W, so can’t comment on streaming ability, but sound quality is pretty darn good.
However, if you’re after something really portable there’s a chap in Bristol who’s building these: http://www.minirig.co.uk
£90 each, can be daisy-chained for stereo & he’s working on a sub. Small but very, very loud with excellent sound quality (built-in volume limiter to stop clipping). 50hrs playback on a single charge. The creator has a background of building speaker stacks for the bristol sound systems so he knows his stuff. I’ll be getting one to play music through my laptop at home & trips away.