If you can retake the classes at a 4 year university, I would. If a JC is the only school near your home, that would probably be OK. But, classes from a university do look better.
I always tell people that JC classes are fine to take some classes, but if you are re-taking a lot classes for a better grade, I would think it would raise some eye brows.
Of course, you should call some of the schools you are interested in attending.