I have a Receptor and a KN7000. I use a hybrid setup, with the KN7000 providing rythm, and my Receptor the lead voices from B4'2,K2,and Collossus. You really cannot beat the quality of these voices.
If I were as advanced as Fran and Bill, I would probably go their route,and probably will.
Yes, there is a learning curve, but I am through buying $3500 keyboards every couple of years, and the Receptor is only a double rack space module. Sound is the name of the game, and I demand the best,period.
Bernie
If money were no object,however, Wersi or Liontracks would be what I would get.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact