Snoopdogie187

If you know anything about how to install car radios, it is not hard at all. Mostly just know the purpose of each of the wires to the radio, for about a $100 you can just pick up a new radio and install it yourself.
You just have to make sure that the speakers you currently have can handle the watts of the new radio, but if you get a cheaper one I think they generally won't have as high of watts as some of the more expensive ones. Also if you wanted you can get a new radio and four new speakers (or two if you do not care about the fronts too much) and install all these.

I have played around with the radios and speakers a little, both factory and not factory. And even changing the back two speakers in an all factory set up will increase how it sounds and i think it also makes it slightly louder or at least in my case it did.

It is just dependent on how much you want to spend and your budget, but $100 is due able just for a new radio if you are ok with doing the work