It's a very good starting point since it will be a negotiation anyway. I'd try selling locally first since there wouldn't be shipping charges added on top. I'd look at it this way; you got it for a really good price to begin with. You'll never recover full price for the case no matter what. If the buyer doesn't care about the case (some don't) you can sell it separately - plenty of people looking for Electro cases. The problem with mods is you rarely get your money back especially if you pay to have them done. But heck there might be someone out there that wants just what you've got. Best of luck wherever you land with it.