the Cs-80 is realy the king of the hill, but the CS-50/60 isnt far behind at all. The main drawback of the cs-50(compaired to the 60) is the lack of ribboncontroller. But the ringmod, filters and pwm are the same in all of them.
Ive played the CS-80 several times and shurely Id prefer to have one but the price diferens is over the top. You can have a CS-50 and (maybe)VCS-3 for the same price as a Cs-80.
Gear: Minimoog, Mother-32, Roland MC-202, TB-303, (Boss) DR-110, TR-505, TR-808, Alpha Juno 2, Jupiter-8, Oberheim SEM, .com/oakley/moon/mos-lab/STG/Sputnik/MegaOhm-modular & Microbrute