If you think it's worth $600, or close to it, put it on ebay at that or best offer and see what happens. It's been so long since I've sold anything on ebay that I have no idea what the listing fee is, but, as I recall, it's not that much. If you don't get more than the "keep" value, then hold it for better days. I know that the market for bikes may be depressed and that the great hunker may be keeping people out of the market for cost savings reasons, but that's a fine bike and there's probably somebody out there with some cash who wants it.