ID Please Cooper's or Sharp Shinned

Saw this bird perched by the side of the road on the way to work. Cooper's are more common here so leaning that direction. The bird never turned to show the tail better even though I watched for over 5 - 7 minutes. Size is so difficult for me to judge with nothing to compare it to. Surprised by all the white on the wing too. Not shown for either species in my bird id books.

My vote is for a Sharpie. The shape of the head and neck, the tail looks pretty square from the angle seen. I have never seen a Sharpie with the whit on the wings. The only other thought I had was in your area could this be a stray up from the south that I am total unfamiliar with.

I think this is an adult sharpie Sally. The tail looks too short in relation to body for a Cooper's. Also the beak is very small. I vote sharpie.

http://www.birds.cornell.edu/pfw/AboutBirdsandFeeding/accipiterIDtable.htm

May be this can help you.