......... What are you playing now?
KN800 was my second of the KN series. As you, I sure have a lot, if not most all there is of Technics stuff, and looking for a mint KN6500 hopefully with a HD to make that stuff up and shine again.
Now I'm using a Roland G-70, sold the Ketron SD-1 to be ready for Audya, but because of lots of delays and when it finally came out, here it cost the same as 2 other top Arrangers as well as lots of bugreports, I did not buy it .... yet.
At the moment Korg PA3x Pro looks quite interesting, but no hurry, G-70 works well for my use while wait for next arranger to explore.
Still the other brands have a way to go to compete with technics OS and userfriendlyness.