[SubaSteevo]

Depending on what you listen to it may or may not be necessary. For example a 200W headunit doesn't really matter if you listen to classical. I'd say the headunit is unnecessary unless you want something with lets say Mp3 compatibility. I spent just under $100 on my speakers,amp,and sub so for me it was worth it but as knvobrian said, its all personal preference.

P.S. You would most likely be unhappy without the 6x9's. I just keep my back seat down.