The head and bill size as well as the apparent white V seem to indicate Neotropic but I am not positive as certain feildmarks are not visible and I don't really have any experience with this species. I would post a link to these photos on the Arizona Listserve asking for a definite ID if I were you as I don't think anyone here will be able to tell for sure.
2008 Yard List: 126
Recent: White-winged Crossbill, Pine Siskin
Highlights: Hoary Redpoll, Golden Eagle, Fish Crow
2008 Year List: 197
Recent: Pine Siskin, Northern Gannet, Red-necked Grebe
Highlights: Cackling Goose, Black Vulture, Merlin
