I just wanted to reiterate what bigbrass said.
I love Roland, Oberheim, ARP, Mg, Sequential Circuits/Dave Smith and... well, just about everything synthesizerie. But bb is right, these instruments are modeled all over the place. What is sorely missing is the venerable, ubiquitous and very hard to duplicate Yamaha CS-80. In hardware, I'm aware that the very expensive Studio Electronics CODE synth has CS-80 filter options - in the vicinity of $2400 just for a two voice module. The Synthesis Technology MOTM modular synth has a CS-80 filter module - heck, it even has a GX-1 filter! But making a four voice polysynth out of one of their modulars would cost far more than the CODE 8 voice. And those are all I'm aware of as far as harware options, and you still don't get an authentic CS-80 oscillator unless you buy the real deal, and good luck finding one in good shape you can afford.
I know that Arturia offers the CS-80V, and I'm sure it's superb at delivering that sound, and the modules exist in the Origin. But not everyone has a good DAW to run the CS-80V, and as I mentioned, making a complete CS-80 on the Origin taxes the system to the point that you can't play a full eight notes.
The CS-80 is in such demand that the hardware synth itself can sell for way more than the $8000 it originally retailed for. And for those who come across the Origin like Keith Emerson and Eddie Jobson, it has been a boon for them in giving them that CS flavor that has become a chore to obtain live, as the original synths have become quite cranky with age and don't travel well. Even in the studio, they need periodic maintenance.
If it wasn't for the fact that the CS-80 modules chew up so much DSP, I wouldn't mind, but it would be more convenient to have the thing already there, complete with the Ring Modulator unit on the panel ready to have knobs assigned to it. And I'd hope that they could optimize it so that it provided more than 10 voices of polyphony. Hopefully Arturia is making enough income from Spark and the pretty darn cool MiniBrute synth to hire a few more software engineers who are skilled at clean DSP coding.
How cool... 80