That's a tough one, do I get what I need, what I want or be responsible.
Our current PC is acting up, likely has something to do with being 14 years old so I do need to build a new one, but that's going to cost more than $500 so I would still need to dip into savings, just not as much.
There's a pistol I've had my eye on which actually has a $499 price tag. But that would pretty much be a me only treat and I'd feel guilty about not spending the money for family use.
So I'd probably just deposit the funds into my investment and/or retirement account. That way nobody get to enjoy it until many years from know when we don't need it anymore. That's what I'm told adults do!