I just got a VMK-176+ to go with my Ketron SD2 and I find it to be a dream set-up for both for ~$1000 total. One thing that helps me is that I also have a Behringer B-Control Nano BCN44 controller that can do the Sysex messages (like "turn on the Leslie Effect"). I'd recommend it as a cheap way to do that kind of stuff. I got mine for ~$45. It is also handy for changing sounds, banks, etc. I even use it to give me 2 sounds at once (piano and strings or whatever).

The B-control fits nicely on the left side of the keyboard while the SD-2 sits nicely on the right.

Thanks for forging the way ahead on setting up the drawbar organ with Leslie.

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-TT