I always go high, someone will appreciate the way the car has been looked after and serviced.
Can get low priced ones, belts not done etc.
All down to the advert, write it up well and anyone in the know, will be prepared to pay top money, in the knowledge the car will last and it wont need a few hundred pounds to keep it running.
You always have the option to take a lower offer, or bring the price down a bit, if you dont get any nibbles.
Sad to see it go. Always reckon its best to keep them, for the little they go for. But needs must. Good luck with the sale.