Ranger boots when they were 1m. :| I used to clue scroll a lot. As in that was all I did. Before I quit in 07 I just did quests until I got my quest cape and then I just ran out my membership doing scrolls.
My best was an elite I got the day the game out. Got a dragon plate ornament which I traded for all the newest god cloaks. Basically it went from a 3m value to a 10m value.