Yes, If you are going to upgrade the sound system concider only upgrading the speakers and maybe install a 4 chanel amp w/ a single sub wolfer. I've been there. The sound system that comes with the car is awsome, the speakers don't hold heavy bass. I'm not talking about rattling the car next to you but a nice smooth and responsive thump. Ask around and search the web, then try it out.
I had installed 4 new Kenwood speakers (2-6" and 2-6"X9") w/ a 4 chanel (60W X 4)Bazoka amp. The sound was nice but it was missing the thump so I added a Bazoka "Tube" in the trunk. sounds really nice now.