How does one define "best?" I've had several Naks that offered very good sound quality and very nice cosmetics, yet their reliability was poor. I had a 880 that didn't sound as clear and resolving as the Naks, but was dead-reliable with excellent tuning features. At the same time, its ergonomics and susceptibility to noise left some to be desired. A 9887 isn't as feature-laden as the Pioneer, doesn't sound as good as the Naks, but offers an excellent interphase with the driver and noise-free performance. So, which is best? Depends on what you're looking for.