The Prophet-12 used to be at the top of the list titled, wish-to-have.
The Prophet-12 has now been replaced by the Pro-2.
Dave Smith Instruments Pro-2 Monophonic/Paraphonic Synthesizer Keyboard
The Pro 2 was designed primarily as a super-powerful monosynth, but it’s also a true, four-voice paraphonic synth that allows you to control each of its four oscillators individually with their own envelope. This makes playing four-note chords not only possible, but very expressive. Package all of this power in a three-and-a-half octave, semi-weighted keyboard with velocity and channel aftertouch, add two backlit pitch and mod wheels and two location and pressure sensitive touch sliders, and you’ve got one of the most feature-rich, awe-inspiring synthesizers ever created.
Paraphonic mode is implemented by allowing each of the four oscillators to play a different note on the keyboard. So you can play four note chords going through one or both of the filters. That’s cool, but what’s really brilliant (and my favourite trick on the Pro 2) is that you can still independently set the oscillator’s waveform, pitch, modulation etc. So each note of your chord can be using a totally different waveform and pitch offset. Each “voice” also gets its own amp envelope, which helps to make it feel even more like a fully polyphonic synth. Throw the arpeggiator into the mix and you get these amazing, evolving, timbrally complex, melodically shifting sequences that sound like they’ve taken hours of painful editing to achieve. It’s a very cool thing and definitely not something you will find in many synths. Review at Rozzer
Terrific and wide-ranging interview with iconic Mr. Smith