Hmm , I can't say a specific amount, only enough that allows me to live comfortably, and get the things that I need, to live a content life.
I wouldn't mind being filthy rich, but then I'd run the risk of becoming materialistic (trust me I know myself), then I'd buy things not because I need them, but simply because I could.
So I just want enough to live comfortable, not to wonder how I'm going to pay this and that-- and enough that I can indulge myself now and again.