Hello,
I have owned a used JV-90 for 7 years now with a VE-JV1 expansion board as well as an SR-JV80-99 demo expansion board installed. Picked it up at a Boston Guitar Center for $800. It is a great synth with a 76-key weighted action keyboard similar to the A-70. It was - and is- a great synth, BUT, since this is 2004, I would go for an Alesis QS 7.1/8.1, more bang for the buck. The Roland has resonant filters, which are good for lead-line sounds, and that is what it excels at, as well as pads, BUT, support and news sounds are nonexistent (superseded by a gazillion newer Roland models). I have an Alesis QSR, plenty of good pianos right out of the box. I would not sell my JV90, though, irreplaceable and useful. Its pianos are good for "cutting through" a mix, ie. inlive PA's, but you'd be better off with the Alesis, IMHO.
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Currently main setup on stage are:KORG PA4X,PA1000