Audiovox is generally low quality...
You can go with the Nissan OEM one found here (may be better priced elsewhere)
Genuine Nissan 370Z 2011-2012 Rear View Mirror w/ Back Up Camera and Monitor OEM | eBay
They also make a nice cheap and well integrated camera seen here..
Car Reverse Camera Nissan Versa Pulsar Cube 350Z 370Z GT-R / Infiniti G35 G37 | eBay
The only issue I see is that for the cost of the OEM mirror, you can get a nice double din radio with the backup feature built in (the route I went).