Montunoman, I share your thoughts about the Sx900; I feel the same. I am going to add my KMA to the Sx900, I love some of the sounds.
Reasons for buying a new keyboard:
1-Owned every keyboard that Technics made from the Kn1000, to the Kn7000 --- and I was never disappointed.
2-I always bought the new flag model when I played out; I was being paid top dollar, why not.
3-I enjoy setting up a new keyboard --- it brings new interest.
4-I sold my Yamaha Tyros 3 to buy a Korg pa800; more drive.
5-I sold the Pa800 to buy a Korg pa4x ---- that was Don’s fault (smile) If I was still playing out I would have a Korgpa4x, or a Pa5x keyboard.
6-I bought the Yamaha Sx900 because it had many of the same features that the Kn7000 had. The Sx900 had less drive, but over all sound was richer.
7-And sometimes it’s BORDOM, BORDOM! BOORDOM!
There are many opinions out there, and that’s good.
John C.