oh yah forgot about the audio tips.
I sugest an Alpine brand receiver (head unit) and if you want an even better+louder system, get a seperate 4 channel amp in the back instead of using the head unit's built in amp. Clarion, alpine, & nakamichi all make great receivers. Then you have panasonic, pioneer, kenwood & jvc. They do the job but there are better brand receivers than those.
In ANY case, do not use the stock amp that's in the trunk behind the carpet liner.
MB Quart makes some niiice speakers [that probably what I'm going to choose], infinity speakers are nice.
I advise you to stay away from sony's car audio equipment, the specifications of their products are the worst I have seen and can't believe sony's serious about selling that kind of cheep equipment at such an expensive price.