Are you moving to the Phoenix area? And planning to dive
locally most weekends here?. Because almost all of our lakes are fed by silty Colorado River water and we have a lot of boat traffic so at all except for one visibility is often measured in single feet. For that reason I'd go with a MK17 or one of the Aqualung diaphragm models since they're sealed by design. Lake Pleasant is the one exception where visibility is sometimes in the 10's of feet but deeper it's still colder and dark/cloudy. LIghts are used for any sort of visibility during the daylight.
Nothing really gets super cold here though and many divers travel to SoCal to boat/shore dive. We're an hour flight from the LA Basin with dozens of dive operations going out to the Channel Islands. Also San Diego/La Jolla for the kelp/sea lions. Even in winter, I've dove an unsealed reg there with ho issues.
Also we dive in Mexico. Rocky Point is at the end of the Sea of Cortez so due to tidal exchange it can be a little sandy/murky. Cleaner water is down near Guaymas at San Carlos - one of the shops here and one in Tucson both keep large dive boats there. It's usually pretty clear except for the algae blooms in spring. And maybe gets into the mid-50's in winter - at the tail end of summer it's 80 degrees though - I've been diving there in October in a t-shirt. On that dive vis was close to 80'.
My point is probably most standard diaphragm regs can handle all the conditions here adequately. I own Atomics but b4 I bought them I also considered an Mk25/S600. Now one of the Aqualung Legends would also be on that list.
There's about 4 Scubapro dealers in town - one is a Platinum Reseller. And maybe 5-6 Aqualung dealers - including the shop where IMO the best reg. tech in town works. I believe we also have 1-2 Hog Dealers in town - a buddy is also one of their dealers but he works out of his residence.
If you're moving to one of the smaller AZ cities check the
shop list here and see what they sell/service since in many towns they're the only dealer for a hundred miles or more.
Also I wouldn't buy anything in Brazil until I find out how the warranty coverage works. When I've looked at some mfr's websites - they consider the US/Canada/Mexico/Caribbean one sales territory so that could apply to warranty coverage also.