Hi Bachus,
The combination of your Korg Kronos and the Ketron SD90 Pro Live module will be a powerful 88-key hammer action arranger setup for your studio. The advantage of Kronos is the most advanced sound engines with the most versatile and beautiful sounds available.
I have a 26-lb Casio Privia PX-560 stage digital piano mainly for its portability, just in case I have to move it out of my house - it has decent piano sounds but the built-in arranger portion sucks. So I use it with vArranger + Ketron SD1000 and Ketron SD90 module.
Currently I am testing the SD90 module with a very old Yamaha S80 88-key synth in my study room, and they work well together.
Thanks,
Paul
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Yamaha Genos, Ketron SD90, Korg Kronos 2 88, Korg PA1000, Casio Privia PX560