An alternative might be a roland VR760
I own a Kurzweil K2600 + the Roland VR760.
The Roland is my onstage board (playing 60ties/70ties pop/rock)
The kurzweil stays in my homestudio.
If I need synthsounds the kurzweil can provide anything I need, but If you don't need synthsounds the VR760 has exactly what you might need.
You can add some of the expansian cards of roland with the old vox/farfisa etc... organ sounds, which is what I did.
I am not sure though if the vr760 is still in production.
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76