If you've got one.
Mine is knife/kitchen stuff at the moment; want one more knife then I think I'll be satisfied for a while. I tend to go through phases though - I'll get really obsessive and blow a load of money into something until I'm happy, then find something else. Was keyboards/keycaps before knives. I'm sure there'll be something after.
It's lucky the girl isn't a spender or we'd end up destitute.