Edit, you'd asked if you could get more (since deleted).... which is what i replied to :lol:
Hard to say. To the right buyer, probably.
I hate to be the bearer of bad news....
But, considering what's available new, or refurb from a retailer with at least a short warranty...
I can't imagine too many people wanting to pay >70% of the price new AND, with a refurb option for $600 it's even tougher.
If it were me, I would only look to pay $400 or so but for someone who really wants it, should pay a little more.
I'd maybe set your expectations that you'd accept $450* and anything you can get above that is a bonus.
*If $450 is too low for you..... you're likely going to be disappointed. The longer you sit on it, the harder it'll be to sell too.