88mkeys and high end arranger capabilities forces you to Ketron SD40 or the upcomming SD90 pro..

Best 88 key arranger is currently the Korg Havian 30, but the arranger part is the low end pa300.

The best 88 key arranger workstations still came from General Music. But thats long ago.. they where truely high end in their time.
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Yamaha Genos, Roland Jupiter 80, Ipad pro.

http://keyszone.boards.net