I have a 2004 silverado standard cab. I've replaced the stereo and the front speakers (sony xplod) and are very happy with both. I replaced the rear pillar speakers with 2 way 4x6 polk speakers for $50. The sound was okay but one of the speakers blew. I don't listen to music extremely loud or music with excessive bass, I'm just looking for speakers that will give me a good overall crisp sound. I don't mind modifying the space for slighty bigger speakers if deemed necessary. I would like to keep the price around $50-$75 if possible. Please offer much needed advice on what to get.