Pioneer delivered a great line-up of AV receivers in 2011, highlighted by the VSX-1021-K. That model was one of the first non-Apple products to offer AirPlay compatibility--the ability to stream any audio from iPads, iPhones, and iPod Touch models. CNET awarded the Pioneer four stars, with only the Denon AVR-1912 besting it in the $500 AV receiver line-up last year.