Also, there is the Korg M50 88 key. It has 80 note polyphony in single mode (40 note in dual mode). It also has Arps, a 16 track sequencer, and weighs only 46 lbs., which is not bad for an 88 key workstation by the way. The price is well within reason too, although about $800 more than the Yammie MM8. But you get a LOT more with the Korg of course.

All the best,
Mike
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Yamaha Genos, Mackie HR824 MKII Studio Monitors, Mackie 1202 VLZ Pro Mixer (made in USA), Cakewalk Sonar Platinum, Shure SM58 vocal mic.