Just wait for the 2 new products Ketron are working on.
Not naming sources there would seem to be a keyboard based on the Midjay, no idea what features it would have and there is also something else in the pipeline, maybe the Tyros 2 killing machine with 76 notes please lol.
I'm sure Ketron will announce these very soon and if they are anything as good as the SD1 they'll be worth waiting for.