I'm pretty fussy about key feel, and I love a good, solid feeling under my fingers. The three kb's mentioned are different, but all share a strong, solid feel. The VA76 has the longest keys (I don't like that), but the pressure feel is better than average.
The 9kpro has the same keys as the TritonPro uses, in case you've played that model. I like the 9kpro keys alot - they take alot of "digging in" and handle it well. They just MAY be the loudest "mechanical" action of the 3, in case you record in a studio environment with live mics ..... just a FYI.
The SD1 has similar, but a bit smoother key action than the Yamaha. Matter of taste. Both are good - both are different, in their own way.

NONE of these three even remotely fells like a piano action. NONE of them....so please don't kid yourself. Is that what you are trying to find out? They are ALL synth/organ feel, but they ARE among the best feeling choices out there today.