Hi delirioustim,
I would echo everready073’s suggestions about an adjustable bed and the ability to make adjustments to your sleeping position can change your pressure profile over the surface of your body and could be very beneficial. Of course it’s also a good idea to consult with your doctor as well. Even though they would generally know very little about mattresses or the materials they use … they may be able to give you some guidance about the type of sleeping surface that would be generally be best for your medical condition.
A mattress that includes a side to side split may also be a very good idea to accommodate your different needs and preferences.
If I was in your shoes the ability to make adjustments to your mattress in terms of PPP both before and after a purchase would be one of the most important parts of my personal value equation. This means that component mattresses such as the Savvy Rest or others that are similar or dealing directly with a manufacturer or retailer that could make fine tuning adjustments to your mattress design after a purchase based on your actual sleeping experience (initially or down the road if your needs and preferences change) would be a good idea.
I would also make sure you have read post #1 here which has the basic information, steps, and guidelines that will be most helpful in your choices.
As Everready073 also mentioned … latex is generally the most durable of all the foam types.
In your case … the knowledge and experience of the manufacturer or retailer you deal with and their willingness to work very closely with you before and after a purchase may be one of the most important parts of your choice.
If you are able to go out and test mattresses then if you let me know your city or zip I’d be happy to let you know some of the better options or possibilities in your area I’m aware of. If you can’t then the tutorial post I linked earlier also includes a link to some of the members here that sell component latex mattresses online with a range of different designs, budget ranges, and options.
Phoenix