What % though, Donny?
Just curious, but if the Midjay is STILL good enough for all these tracks, why move on? But maybe I can see that, although pretty happy with the S900 sound, you still prefer the Ketron 'live' sound for the rhythm section stuff (or you would have re-done the darn things by now!).
It's just kind of strange, but one of the MAIN things I want improved in any new arranger I get is the basic rhythm section... I can get by with the old lead sounds by simply playing as well as I can, but the track or style itself, I have little control over. If I get a quantum leap out of that by upgrading, I sure as hell am not going to put up with the old rhythm section! Plus, I get a mental kick out of playing with what sounds like a MUCH better bunch of players, rather than the same old, same old...
So, 'fess up

How much of your show is NOT S900 only?