Audio Systems: Toyota Camry, toyota camry, pawn shops

Question
i have a 1999 Toyota Camry and i want pretty much overhaul the whole system to make it sound better the requirements for the system are under $500 total and i want to have good bass and clarity any recommendations and sites to shop from would be great.

Answer
add a 4 channels or 5 channels amplifier and replace all the speaker
a single 10 or 12 woofer will do the job  keep the factory radio and will sound great we do that all the time
good luck

i dont recomend brands but stay away from pawn shops or flea markets