I had a similar situation. Took Intro Bio, Chem and Phys at Community College over a year when I was young and immature...did poorly in them (around 3.10 gpa in those classes). I decided to retake them all during my post-bacc year. For me the following reasons were paramount:
1) It had been 7 years since I took those classes at comm. college and barely remembered anything from them.
2) It *was* taken at a community college. And generally there is a discrepancy between the rigor at which they are taught the community college level and at the university level. Many schools whose web sites I've visited say that they strongly prefer that pre-reqs be taken at the university level. The reason is because the increased rigor better prepares you for the MCAT and, ultimately, medical school.
3) Lastly, my grades (mostly B's, B-'s a few A's, a few C's) were very poor for the pre-reqs. Remember, AMCAS has an entirely separate section just for pre-req and other science grades for a reason--they matter more than humanities and social science classes. So doing well would be very important. If you had gotten say all A's at the community college level I would say it would be more of a debate. But a 3.0 (or thereabouts) gpa in those courses from a community college is not good.
I would recommend that you definetely take them over. And try to ge tinto the honors sections of these intro classes. Since you've already taken them, they should be easy and taking the honors section shows initiative--you like challenging yourself.