I found that the Panasonic A3 or A4 priced at $200 was the best I could find, by far, for speakers that run on Air Play. Air play beats blue tooth, hands down in my opinion.
Agree w/ the comment about Bluetooth (BT) vs. AirPlay (AP) - for my 'wireless' music in the house & 'on the road', I've used both standards - now I've not used AP but basically Wi-Fi based transmission which would be similar to the internet radio provider, Pandora which has worked fine for me using my Roku device & iPod Touch; also have BT headphones, portable travel speakers, and HDTV soundbar - BT from my iDevices to the soundbar at 20 ft are more provides intermittently poor audio; so be wary of using BT to span a distance of more than 20-30 ft.
NOW, a wireless sound technology that looks much more interesting w/ better quality, low latency, and more range is SKAA based on the PAW (Professional Audio Wireless) - also operates on the 2.4 GHz frequency band but w/ different parameters of transmission - more information
HERE (also source of the table below) - unfortunately not much in terms of hardware is available for the home consumer market, BUT likely the future in 'wireless audio' -