Sarge, that's a tough one. As one who has been in the workforce since 1974, I can tell you without a doubt that money isn't everything. I've been in the same field since I started working and am making more money than I ever thought possible. For the last 15 years I've been stuck in this field because changing careers would have meant a big paycut which was a burden I couldn't place on my family. Sure, we have a nice house in the country, relatively new vehicles, go on vacations, money in the bank, etc... The downside is I hate what I do. I hate the job, the stress, the hours, the drive, etc...
In your case, the one thing you have in your favor is your youth. You have plenty of time to settle into a career. Maybe try the high dollar, high stress job for a while. You say that you're interested in the subject so the stress may be something you could deal with. If not, then you could always go into teaching later.
Oh and by the way, if you think there is no stress involved in a teaching position, you should talk to a few teachers. Especially those in a public school system. Lack of funding, huge beauracracies (sp?), students that don't care, or worse, parents that don't care. Sure, the rewards are there, but rest assured, so are the headaches.
But whatever you decide, good luck. You sound like someone with their head on straight so I'm sure you'll do fine in whatever you choose.