The Arion SCH-1 is one of the best sounding vintage analog choruses, producing an incredible variety of authentic tones, anything from subtle, clean chorus to a pretty realistic Leslie effect. It was not popular back in the 80s when it was launched, but over the years it has built up a good reputation and acquired devoted users, including some of today's leading guitar players. Although it's long discontinued, you can still spot a used unit on various online stores. Despite the plastic case and fragile construction, it's quite expensive - they usually sell for over $100 on eBay.