I know this is a general question and probably hard to answer, but if you have a ball park idea, it would help.

I am trying to look into different careers, because it is time for me to focus on what i want to study for in college, and plan for etc...

One thing that keeps coming up when i look at each of the different careers is the salary. So, what i need to know, is about how much should one earn a year to be able to live comfortably?

Say a single guy, who doesn't need to be bill gates, but would still like to be able to afford the occational luxary here and there.

I really have no idea about this, what are we talking, $30,000? $40,000? $100,000?