Hi Rlittle,
Welcome … and I’m glad you found us.
You can see my comments about the Spring Air Miranda latex hybrid in post #2 here.
The better options or possibilities I’m aware of in the Phoenix area (subject to the guidelines here) are listed in post #4 here. You are very fortunate to live in the area because 4 of the manufacturing members of the site are based there and you have the chance to test their mattresses in person while most of the forum members can only order them online.
Phoenix