At this point.
1) You don't know what your med school schedule/courses will be like (most all of them have biochem or anatomy in M1, but you don't know how in depth they'll likely be, what they'll emphasize, how the professor writes the exams etc.).
2) You don't know which of these courses will be your weak point, and I doubt any of us could tell you (immunology and neuro crushed me in med school and it wasn't well taught here, and it keeps coming back in many of my classes, I wish I took it in college...BUT, I would not have known this until I took these classes in med school.)
3) On the flip side I took biochem in college thinking and hearing from others that it would help for med school. Turned out it didn't help much at all. Our med school biochem class was so well taught and exams were so fair, that most everyone, even without a background did fine. So my major hardly helped me there, and I don't feel it has given me a big edge in any other classes.
All in all, you just don't know which college classes will help, and which one's wont, until you're in the thick of it in med school. So personally, I'd say don't worry too much about it, take the classes you like. And believe that you will be able to adapt to what comes your way in med school.
The only thing I can say from my experience, and that of classmates is, don't be afraid to challenge yourself (so long as it doesn't tank your GPA). One thing we all know for certain, is that med school course work is hard, it's high volume and can be high stress at times. I find that the one or two friends who took difficult science course loads in college seem to adapt better to the heavy workload here and not feel as overwhelmed.
Also the more upper level sciences you take, the more likely that one or two of them might turn out to be helpful in med school, even if you don't know exactly which one.
Probably not the best advice, but it's what I would say from my own experience.
Just my 2 cents