Months back I happened to watch this Ted Talk which discusses (among other things) the relationship between income and happiness. It was a major eye opener for me. I found it very liberating to recognize that much of what I perceived as a want/need was something that in the end really didn't affect my happiness. I've become convinced that a much simpler existence would actually provide no less life satisfaction, and probably would produce more.
So I just wanted to share a couple of related resources on this topic. I thought the below 9 minute commentary entitled "You Don't Need to Buy This" was very worthwhile.
There's an article by the speaker that's worth reading here.
I recently watched a movie, available streaming on Netflix that's called "Happy." It explores the relationship between perceived causes of happiness and actual causes.