Remove the batteries. If they've leaked can significantly affect the value of the systems. IMHO you're better to look on sites like eBay & Amibay for the value of a system (although Amibay tends to be some pretty die-hard collectors) rather than just asking randomly in a forum. A system is worth whatever someone is willing to pay for it (this is where it's helpful to check on the final price of closed auctions).
I'll start the bidding at $1, lol.
