Ok Larry, you put me on the spot (btw: surprise surprise, the PSR9000 is not included on my list).
My current Favorite (61 note) Arranger Keyboards:
1. Technics KN7000 (tied 1st choice)
1. Yamaha Tyros (tied 1st choice)
2. Yamaha PSR2000 (best bang for the buck)
Choosing between the KN7000 & Tyros depends MORE on your specific needs .
If onboard built in speakers and full keyboard mode 'pianist' mode pro jazz chord recognition is really important, I recommend the Technics KN7000.Unfortunately the KN7000 doesn't support pro jazz chord recognition in split mode, and its vocalizer is pretty much useless.
If you don't need or care about built in speakers, want a lighter weight KB, want the best split mode left hand chord voicing recognition, and a terrific built in vocal harmonizer is desired, then the Tyros may be the better choice. On the other hand, the Tyros's full keyboard 'pianist' mode type chord recognition pales compared to Technics.
Other things to consider: Both keyboard offer excellent navigation, though Technics may have a very slight edge. If exclusive onboard kb sequencing is important, I recommend the KN7000 over the Yamaha Tyros. Swing and jazz styles are better on the KN7000 while the more pop & contempoarary styles are better on the Tyros. My favorite acoustic piano is on the KN7000, afterall I'm biased toward the Steinway sound, I own one. I prefer the auto fill variation change approach to Yamaha, but Technics offers 2 fills per variation compared to only one on the Yamaha. The Tyros includes some outstanding new Mega Voice sounds: guitars and bass voices.
Though the PSR2000 (which I currently own) doesn't offer all the features the KN7000 & Tyros sport, it definitely is worth mentioning because it offers SO MUCH for the money, and really is a terrific sounding board in all respects, and even includes a terrific sounding full featured vocal harmonizer. The only major drawback re the PSR2000 is it supports no mass storage device and that the keyboard action feels more toy like than professional.
In conclusion, I only wish I could afford to own all three of these keyboards because they're ALL so outstanding, just for different reasons.
Scott