What is more important???

For the past umpteen days, I have been quarrelling with myself trying to establish which facet is more important towards leading a happy life. After all, im only gonna be living once and wouldn’t wanna waste the opportunity right? Is it important to pursue a CAREER or could you be happy just dong a JOB that pays you well? I think the eventual answer to this question would be the decision I take in pursuing my post-graduation.
What I can’t decide is whether it is more important to attain financial security or whether I might risk financial security for CAREER satisfaction. If I should choose to risk financial security and pursue a not-so-secure career in a field where my skills might be better utilised, would that be a wise move? Then again, if I am working at something that im good at (atleast relatively better than being the engineer I have turned out to be) I might actually be able to accomplish something significant (or atleast relatively more significant, you get the idea right?) and in the process also get rich. (Notice I didn’t say 'attain FINANCIAL SECURITY?' Hmmm...) Then again can I really suck off my love for writing so much as to be able to write just to earn big bucks? Could I write to meet deadlines and try to be creative just for the heck of it? Or maybe because I would be writing, I wouldn't find those deadlines to be as tedious or the creativity as sapping.
Maybe though, at the cost of being satisfied with my work, I wouldn’t be able to niche out a living (atleast not at the scale that this life as an engineer promises) Maybe I would lose out on the financial security that a fixed salary arriving at the end of every month in my bank account offers. After all, I couldn't eat happiness nor clothe myself with it...
Then again, all the money in the world couldn't contribute towards making me happy. The 8 to 12 hours that I would spend at work would only make me miserable. All my life I will always wonder "What if?" Should I gamble and go out all guns blazing and even if I fail, atleast live with the satisfaction of having given life my best shot, uncompromising and ambitious? Or should I just go with the flow and live out a happy Indian middle class life with the false financial security it has to offer?
I might have said it a million times before that money is not the driving force in my life. Yet, here I am debating the course I need to take my life through, my biggest concern ironically, being MONEY...