600, maybe 700 since the 6.3's are rarer if you are patient in finding a buyer who is looking for that specific one.
That might be optimistic of me, but the value of anything is whatever someone will pay for it, like 8 grand for a AP 130 on astromart that's never been used (supposedly) from a guy who waited 9 years (and paid a lot less than 8k!) and just got it recently.
It might be worth fixing up if it's just a 15 year old circuit board that can be replaced.
As far as getting it fixed, I'm ready to move on to something different. When I decide to list it, maybe I'll give a option to get the ota only or the whole thing for the same price.