Changing cars every 2-3 years seems an awfully expensive thing to do. Im not sure why you do it that often, but this is me speaking from no doubt a totally difference financial perspective.
Having said all that, your ED30 looks totally spot on, and i think your asking price is also fair. Before you mentioned the price i had a figure in mind which was actually above what you listed it at, so good luck with the sale.
I think the problem with the ED30 not holding it's resale value as highly as it should is because of the R32, (which arent holding their value that much either tbh), putting the ed30 in a difficult middle-ground territory.