Bebop. A friend has had his Korg PAX (61 keys with speakers) for 4 weeks now. I have spent 2 full nights with it. I like everything about it. The on board speakers are the best I have heard from an arranger, including the KN7000. A lot of the voices are of the mega quality type (voices change depending on key pressure). Unlike the Tyros Mega's, these Korg Mega's can be played live. The styles are very good and all inbuilt styles can be overwritten.
Korg have just released a new OS v2.0 which has added a lot of options which owners have asked for. The only other board which may come close could be the new Roland G70 which I have yet to see. Another good point is it's a new model and Korg don't change models every 2 years.