Which head unit

I am looking for a new head unit to replace the factory one, my requirements are that it has bluetooth hands free phone operation with an iPhone 4 and Bluetooth streaming and also must work with the Nissan steering wheel controls.
What does anyone recommend?
I would rather go this way than fitting my parrot unit I took out of my last car.

Cheers
 
I use a sony one, it works well with my iPhone 4 and you can buy the wiring adaptors on ebay for standard car controls.
 
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