Hey im new to car audio and don't really have a clue what type of set up i should get. I have a 2003 toyota highlander and want a system that has a good mixture between loudness and sound quality. I dont have a very large budget it's only 400-500$. Im pretty sure I need 4 speakers, a headunit, an amp, and a sub. I put together a list of things but im not really sure if its good so im looking for suggestions about what parts to pick. Thanks.