Sorry for the slow reply - I have been traveling the country working Chertow camps so my 'puter time has been limited.
Homer's summary was dead on. Sunnyside is far and away the best. He did leave out Mingus HS in Cottonwood Arizona which trains kids in a hard nosed style of wrestling and they travel nationally a lot as well. Them, Safford, and the Phoenix metro schools mentioned, are all pretty close for second best in the State. Camp Verde does remarkable things with very few students and supports the sport with open room tournaments on most weekends.
I will say Arizona wrestling will be better for the next few years, but I don't know if they have the talent coming up to reload after this current group goes through. There isn't a heck of a lot of kids who take the sport seriously like they do in other parts of the country, so while there are some tough kids who do well nationally, due to a lack of depth they have a hard time getting regular tough competition.