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Make sure that the speaker isn't blown. Many times the plastics and metal of the door rattle instead of the speaker itself. If you are going through the trouble of swapping speakers, its common practice to swap with new parts or newly rebuilt parts (to avoid doing things twice...which is more likely with used parts).

Also, figure out what you are expecting from the speakers. If you are looking for deeper bass then you may not ever be totally satisfied with the door speakers. If you want deeper bass and more driving power, then you may need to research and plan on a subwoofer and amp upgrade or addition.

Its not easy planning and installing that ideal system. I've had success in the past with adding on to the existing system; You may want to seek out advice from experienced installers to figure out what you are really looking for from your speakers and system.