I would guess $3K would sell rapidly, $3500-4K would be fair, and anything higher would have to find the right buyer to move.
If eBay is a possibility for you, then I might try a run there with a low starting bid and high reserve to see what the current market thinks. Maybe start at something under $1500 and put the reserve at $4500. If it sells at that price, you will have done well. If it doesn't, you'll learn what the high bids are and the amount of interest.