I just got my first new (second-hand) synth for a long while, picked this up on ebay, it needs a little bit of work on some of the keys, but apart from that all seems to work fine.
Its a Casio CZ-5000.
It uses phase distortion as its sound source. It has not filters but from the quick play I’ve had with it, it has a really nice vibrato and stereo chorus. It is quite simple to program and edit patches. I have managed to find a bunch of patches on the net for it, so I look forward to loading some of those up and giving it a run.