Hi Justin,
I am a working scientist with a Ph.D. in human genetics. In terms of potential future jobs, your best bet is to stick with subjects with medical or industrial applications. Chemistry is not bad, particularly protein chemistry, as most companies are always looking for good protein chemists. But the bottom line is that if you are interesting in basic research you will struggle like hell. I unfortunately find pure medical research boring (my own prejudice) and have worked on molecular evolution and basic research in virology (with some prion research thrown in for flavor) and I have cost myself at least 6 years and several promotions relative to my colleagues from grad school. You also risk working in a field for a very long time and then not finding employment in science period. The companies and medical researchers will find you are too specialized in a non-applicable field and the number of basic research or higher academic positions are very scarce. With the exception of the UK, europe is a research wasteland. Germany in particular. Stick with the U.S. If you are really up for a career in basic research, prepare to give up a lot and live in constant risk of failing. If you are interested in biotech or medical research, the hours are still long and it can be difficult but you will have much greater opportunities.
Though my tone is negative I don't want to discourage you from trying to make it in the sciences...If you want it, you will make it...but the idea that you will be well supported, respected, and have golden opportunities in the sciences and that every day will bring an exciting new breakthrough is a myth and one should approach this career very carefully and with better planning than I did