I saw an ad for a new one (OR ready version) at $599 a couple days ago, so I doubt you can get more than $500-$550. I know yours has added accessories, but the buyer isn't likely to value those anywhere near what you paid for them. Why not list it in the classifieds here for $600 and see what offers you receive?

Unfortunately I don't remember which vendor emailed the ad, and I have deleted the email or I would reference it here.

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Or something like that . . .