The updated version of the PSR-E403 is coming this month - PSR-E413.  It's not top of the line, but still is pretty cool.  100 arps (as opposed to 50 in the 403)  Also has a knob for live control of filter, resonance, etc.  Even has some decent "live", "cool", and "sweet" voices.  Great little board as a companion to your setup... a bang-for-the-buck low-end board for only $230.
Tim
[This message has been edited by CoasterTim (edited 05-05-2008).]
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Tim Schaeffer
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YAMAHA CVP-509 / Korg Pa300