Hello all, I'm looking for some advice. I have a 2005 4Runner Sport with the JBL system. I want to replace but can't do the radio and speaker at the same time due to cost, so I'll have to do it over a period of time. If I had to replace one over the other, which one should I replace? I have an idea of what component speakers and HU I want to replace it with. I also want to replace the subwoofer in the back. Thanks in advance!