Hey don't beat yourself up over it. I bet you got the additional $150 worth of fun out of it while you had it anyway. So no great loss. Old digital synths simply don't hold their value because they were very early technology and were surpassed many times over. On the other hand old analog synths do hold their value better simply because they were at the peak of analog technology and were not surpassed because the new digital technology took over.

Having said that I still love DX7 FM ... while it is difficult to program I really love the playing response many patches have. But nowadays I would probaby prefer to experience it on a newer workstation like the Korg Kronos that provides FM synthesis plus much more.