First, I'd buy pretty much whatever the hell I wanted.
Then, I'd buy whatever my friends want.
Then, I'd buy more stuff, like an angelic sash or fairy wings or something, and surprise random people who are questing for exspensive stuff like that with them.
Then I'd buy another rare, expensive item (how rare and expensive depending on how much I had left) and give it to some totally random newbie :3
I'd do lotsa stuff X3