Since I kinda like my stock headunit I was wondering if I HAVE to get rid of it in order to get better sound quality, or would some aftermarket speakers and an amp do it? Honestly I would have serious issues about not being able to use my steering wheel radio controls anymore, and I'm not so sure they can be used with an aftermarket headunit.

EDIT: I have the Rockford Fosgate "package," but from what I understand the only thing that's RF is the sub in the back, is that right? Is that worth keeping?