My personal preference only from reading about them over the years is the Ensoniq Paris. Lot's of good stuff in Sound on Sound about it. The Yamaha is a bit newer if I recall, but the Paris is just a neat piece of gear. Also if it makes any difference, the Yamaha is more common to find than the Paris by a long shot in full working order than the Paris rigs.

Nope I don't think either of them support osx though. I've been on a JL Cooper kick recently too. 2 CS-10's and will pick up the MAGI II this weekend. Already have 3 Digidesign R1 controllers in the basement lab now.