Not really the right section for prices mate, but i'l help you out anyway
Ayt well even if you max str/atk now it'l be over a dfs pure, it hasn't got some amazing stats, although it has some good ones, not including any money/quests you've done on the account i'd say max you'd probably get would be $40 for the account itself, maybe not even that, how much cash/quests/holiday items etc it got? will help.
As regards what to do with it, i'd say max attack/strength, leave defence at 76, max range/mage and sell it, advertise it as a dfs pure, the 1 extra defence will hinder the price, but only slightly.