Difficult cars to judge value on, see them on ebay and the values are all over the place. These should be enthusiasts cars as the runing costs can be high, which i think is why some look realy bad as some owners just cant afford the upkeep. But find a good one thats been cared for with full history and preferably manual then the value goes up. See them on swedespeed with over 300k miles.
Sold my flash green geartronic on 90k last year for £7,500 in very good condition, guy is putting it away and leaving it to his son, so the £8k sounds fair based upon the description. Just depends who comes along.
Good luck