I'd say anywhere from $500-$800 or so.
If you're planning on selling it here, unfortunately I don't think you'd be able to
get that much simply because there are a lot of scammers that are selling their
accounts for cheap because they plan on recovering it.
I think that if you want to sell the account for a fair price, and you legitimately aren't going to recover it back, I suggest trying to sell on Playerauctions, and offer buyers insurance.