Hi Grizzlyman,
You may want to read post #2 here before excluding latex. For most people with a latex allergy (type IV) a latex mattress wouldn’t be an issue.
There is more about choosing a mattress in mattress firmness/comfort levels in post #2 here. Side sleepers typically need a little thicker comfort layers to ease pressure points but either your own personal testing on local mattresses for PPP or more detailed conversations on the phone with a knowledgeable and experienced manufacturer are the two best ways to choose which mattress is the best “match” for your body type, sleeping positions, preferences, and circumstances.
Phoenix