I'm looking to get a not so expensive audio system for my car. I currently have space for two 4's in the front, and I believe two 5.25's in the back. I also have plenty of trunk space for a amp + subwoofer combo. I want to use my audio system for Techno Music, so I guess i'll be needing some form of subwoofer. My budget is ~$130 for each piece, that way I can buy the parts in a reasonable time-line.