I will be using the Roland A-800 Pro midi controller with my Ketron SD90. It is a 61 key keyboard with dozens of knobs and sliders which can be assigned functions. It has been a very good keyboard for my needs and you might take a look at it.
I have no experience with any of the other products you mentioned in your post.
Deane
Thank you Dean, i still own the predessor of that board...
The Edirol PCR800...
Great board, but i am trying to find an 88 key weighted hammer action keyboard with both masterkeyboard functions.. as well as an authentic sound that can be combined with the sd90’s,sounds