Well...after reading this thread and getting pretty tired of being surprised what shows up next to me, especially the electric cars (I don't hear them at all!)...I opted for this one. I am not sure how well a mirror on my head would work while riding through traffic. At least now, I am hoping I can mount this thing somewhere to help.

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1