//I think if you are looking at used keyboards,
I would look for a Roland G1000, or for a
Roland EM-2000. They were selling them new
for around $1000 less than a year ago.
They have almost all the oud and kanoun
variations that the E-500 has, and are top
of the line boards. The only bad thing is
that they may take a little longer to learn
than a GEM board, but are surely better than
learning the E-500.//
my Personal Opinion

...I think that the OS for the E-500OR is easier than the G-1000.the E-500OR is missing stuff in it's OS and it can be solved by a nice Update for the OS.but where dealing with Roland here

so forget it.the G-1000 is nice but there is allot of buttons to press before you play any thing.IF you want the G-1000 then know that you will deal with E-40s sounds only.so as the Em-2000 AND (DISAPPOINTING!) VA-XX.E-500OR and Em-50OR have complete different sounds.
//before you buy this, compare it to GEM WK2 oriental.//
one thing the prevented me from buying the WK2OR is because there is no Seq.and it's only 32 Polyphonic.sounds were nice though.the E-500 have a Seq. and 64 polyphonic.there was WK3 which had a PERFECT SEQ.! but I don't know why they are not selling it no more.
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vic:)