The Korg KARMA is essentially a Korg Triton fitted out be more of dance synth. It has probably one of the most exotic arppegiators ever devised. I've been using the synth on a 'hobbiest' level for year and I still can't get my mind around it. But, the synth has all the grandieur of the Triton in terms of sounds. To get the full Triton sound-set you have to buy and install a MOSS board.
These are becoming extremely hard to find.. I think they only saw one year of actual production. Still, if you are synth collector... the KARMA is a great example of a great company like Korg taking an already great machine and adding some experimental concepts.