CLOSED: blue bird with pointy head

I am lucky to have a few of these birds in my backyard and love watching them. They are blue, with pointy heads or mohawks as we like to say, and are very active flying all around. ID help will be greatly appreciated!

a cropped picture of the bird

This is a Tufted Titmouse in the black-crested race that occurs in Texas and Mexico, according to one of my bird books. But wikipedia says it's now considered a different species, the Black-crested Titmouse:

http://en.wikipedia.org/wiki/Black-crested_Titmouse