Adding a bluetooth to base model for hands free calling

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CX-5, fwd auto
Hi,

I wanted to ask as I want to add bluetooth for hands free calling on my base Cx-5.
Should add backup mirror with bluetooth (slightly cheaper than changing stereo unit) but I am not sure if sound quality is good enough, and pictures is viewable during the day. (I read many reviews on Boyo and Rearview safety LCD mirrors)
Or place a new double din stereo unit that has backup camera and bluetooth. This is about $250 more than doing the back up mirror.
Which route should I go? Please give some advise.
Thanks
 

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