Can you help a stereo-illiterate guy out? I am looking for speakers (Front & Rear), an amp, and a sub to help make my stock stereo sound decent. I want to keep my interior looking stock, so no new head unit. Any suggestions? I'm just looking for a decent, quality sound... nothing crazy. Oh, and I'd like to keep it all under $500. Mission Impossible? Does anyone out there with the stock head unit have a nice sounding system? Thanks in advance.