Kurzweil 2600, so I agree with Morph on this one but I would like to add that "timbre" is the result of Vast and KDFX and secondly it is still the Synth with most capabilities if all options are installed.
(which are on mine)

Acces Virus C: Top quality sounds and still the Fastest" programmable synth I ever had.
(has enough knobs)
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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