I believe it was the great philosopher Kanye West who said, "having money's not everything, not having it is." Now his words have some statistical support, in the form of a new study. From the NY Times:
The magic number that defines this “comfortable standard” varies across individuals and countries, but in the United States, it seems to fall somewhere around $75,000. Using Gallup data collected from almost half a million Americans, researchers at Princeton found that higher household incomes were associated with better moods on a daily basis — but the beneficial effects of money tapered off entirely after the $75,000 mark.
You know, it's funny, I saw this exact same study back in 2005, except back then they claimed that the salary you needed to be happy was $45,000. So $75,000 will make you incredibly happy, unless you live until 2018, at which point you'll need to be paid at least $120,000, minimum. And if you survive until 2027, you better make $300K. The lesson is, money doesn't matter, just make sure your salary is twice the national average.