What is the best brand of speakers for AirPlay...?

There are two brands of AirPlay speakers currently available. Bowers and Wilkins with their Zeppelin Air speaker and JBL with their On Air Wireless speaker. They're both decent AirPlay speakers but Bowers and Wilkins is the premium speaker here and it shows in the price, costing almost twice as much as the On Air Wireless. There are a number of AirPlay speakers announced but not yet available for purchase. They're from the following brands: iHome, Klipsch, Libratone, Phillips and Marley. You can also purchase an AirPlay capable receiver and connect it to speakers or get yourself an Apple AirPort Express or Apple TV and connect it to speakers. Either one will show up as an AirPlay device in iTunes and on any iPod Touch, iPhone or iPad running iOS 4.2 or later.