Nice pictures. I love watching those birds hunt.
We've got a couple coopers hawks and an osprey that hang out around my back yard. The osprey is a big mofo. One of the coopers chased a dove straight into my living room window last week.
Anyways, I agree with the above posters that have been saying Coopers Hawks. Comparison pic.
http://www.flickr.com/photos/mountainpath/59212657/