http://www.amazon.co.uk/Analog-Synthesi ... 519&sr=8-1
The author suggests a price that is a mix of the reliabillity, the sounds and the overall usefullness of a vintage synth compared of what is it in the market today.
For the CS80 especially, says that despite ANY
asking price (including nothing off course!), serius reliability and service problems should make the potential buyer VERY carefull.
CS80 is very difficult and expensive to restore and fix.
That's me, but prices like 3.000$, 6.000$, 15.000$ are rediculus for ANY vintage synth (except perhaps big Modular synths).
Even Vangelis doesn't use it any more. Instead, he sampled some sounds from it and thats all.