rrnnss - from your signature I can judge that you are discussing a Hyundai Getz.
Please buy a decent head unit (A CD/MP3/FM player) for about 6000. The options I can suggest are Pioneer, Alpine and JVC. I would recommend you avoid Sony.
For speakers you can get 6" multiaxial speakers for all 4 doors. Popular brands are Blaupunkt, Alpine, JBL, Hertz etc. This should cost you about 6000 for 2 pairs.
This should suit you very nicely, given the fact that the music you listen to is probably not rich in upper and lower frequencies.
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