I think Ketron is the closest to a "Pro" arranger board. They don't even try to appeal to the mass markets, except with very expensive wooden cased models of the portable models.
Bought a Roland GW-7 to use as a piano and controller from George. For another inexpensive keyboard, some of the sounds are pretty good!
[This message has been edited by captain Russ (edited 06-12-2008).]