Do i buy the aux cable for my head unit to the iPhone 3G... Or is the bluetooth just as good. My VR3 head unit pairs to my iPhone so i can make calls, and answer them through the speakers, and it has a built in microphone. But i was wondering if i can get better qaulity threw the cable instead of via bluetooth.

Cable is better than Bluetooth. Simply a matter of it being a direct link for data transfer versus an over the air data transfer link.
A few months ago I bought my wife a 4runner and tried both ways with her iphone, and via cable she got a clearer audio quality.

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