What should I do about the system set up?

I'm mostly all about the engine modifications and all, but I don't want to neglect the interior either, so with that being said what do you think are some smart moves to make as far as it goes with the stero system. I have a 01 Honda Accord Coupe EX. I like the stock system and all but the speakers don't get that loud and I want them to get a lot louder. I know from experience from installing lots of systems that most of the time you have to switch out the head unit to get a better sound, but do you think that if I were to just change out my speaker to 2way bass component speakers, that I might get a better sound?