Hi Squeak,
I still have the PSR550 and A Roland EM20, the EM20 is also hooked up to my computer running OMB software and GS soundfonts. I will try to demo the new Casio 3700 and the Korg PA50 next week, if available. If they all sound good I will have lots of dilemas: Should I buy a Casio 3700, a Korg PA50, continue with softsynths, or wait for the PSR3100.
Its a shame about the Fusion.
Starkeeper