jMonkey:
Often, deciding between two options is very hard.
At this point, you seem to be focusing very much on your life missions (your career), but it might help you tremendously if you could set a Vision for your life before you make this decision. There is a distinction here, which I will explain.
As somebody already said, think about the contribution you want to make. You can also think about what you want your life "to stand for," or even what your legacy may be at one point. Basically, you must find the meaning for what your life is to be *for you.* Then work out a Vision statement (a short paragraph) that you can repeat to yourself whenever you need to.
That is at the center. After that, you can project that vision into several "missions" that fulfill it. A mission, then would be something along the lines of your career path, just as you stated above. Working on these missions is how you bring your Vision alive for yourself and your world.
Now finding your Vision is admittedly not easy. In my book, I point out several ways that combine your interests, moments in which you are in "flow," mindmapping, etc. that let you discover several choices, from which you then can cast this mission. Such a vision quest should not to be done quickly--especially if you are talking about a 14 year commitment. But it is absolutely crucial if you want to live a fulfilling life.
For before you can be fulfilled, you must know you are.
I wish you the best life. Enjoy, and Be True!
Hanns-Oskar Porr
The Steps Of Essence: How to Live Life Well and Authentically.
SeinQuest also on Amazon.com