Shift,
I really don't think your course selection at cc is going to have much to do with your chances for admissions to grad or medical school. What matters at this point is getting really good grades. It also matters that once you are at a four year school that you cultivate relationships - working in labs, doing undergraduate research if possible and knowing people well enough that they can write you recommendations. That's the stuff that will put you in a better shape as you go on. Also, it sounds like you have the idea if you need to take an extra year or two you will. That would allow you to take more upper division courses which is certainly a positive when it comes to graduate school admissions.