Here is a re-post of my old demos of two synths that unfortunately I no longer own: the Korg DW-8000 and the Delta.
The DW-8000 sounds great but it is a heavy space-monger in the studio. A lot of folks opt for the rackmount version: the EX-8000.
The Delta has the flexibility of having both a synth and stringer all-in-one, even if the synth osc is a simple square. Albeit the string sound is a little cheesy organ sounding, too. The warm multi-mode filter and joystick help make this one a favorite of synth fans.