For those who have managed to set a custom Hands-Free Phone System, I would like to know the microphone you have used and also where you have it installed ( in the purpose of hiding the wire and having a high voice efficiency).

I heard the Andrea Electronics DA-350 is the best out there, but the 350$ cost for a mic seems a bit overpriced...

Opinions ? Comments ?

Or will it be a better alternative to get the Nissan's Bluetooth Hands-Free Phone System ?

PS I own a 350z '06 with car pc installed in rear passenger back seat.