Since the question is personal I'm going to answer it base on how much money I need to be happy!
They say 'money can't buy happiness' well they may be right but I'm happiest when I can go out and buy whatever I want without checking the price tag,travel without money contraint! Money is not everything and happiness means different things to different people but the amount of money that will bring me happiness is the type that I won't have to worry about price tag whenever I want to buy anything!