my friend's looking into getting a pair of s600s components for his '02 IS300, keeping his rears stock for a larger frequency range, and eventually getting an amp and one 10" subwoofer any suggestions on what he should look into? he's only looking into a single 10" because of trunk space limitations, and he doesn't want his car to rattle and sound too ghetto. and as far as the amp is concerned, what's the optimal setup and what kind of amp should he look into? he's on a budget of course, so he doesn't want to spend more than $100 for everything for a decent setup. what do you recommend?