[HardcoreZ28]

Get yourself some good front and rear speakers and a midrange headunit. I have Cerwin Vegas in the front and Pioneer 3 ways in the rear of my car and they sound great. Later on save up for an amp and a sub or two. You can make up for a lower powered/quality headunit with a good amp later down the road if necessary. There are lots of good deals on Ebay if you take the time to do your research. I did my entire system for about $650 and I love it. That was with a very expensive headunit that I bought simply to spice up the inside of the car.