Hi Taino,
As you’ve probably read on the site and in various forum replies … the biggest challenge in your case will be to combine side sleeping pressure relief needs (thicker comfort layers) with the needs of stomach or “combination stomach” sleeping (thinner comfort layers).
The “common” need you have with your wife is good support in your hip/pelvic area as both of you will likely have a tendency to sink in too deeply there.
You would be a case where I would recommend testing high quality dunlop latex in both the support and comfort layers to see how it works for you as Dunlop has a higher support factor than Talalay (gets firmer faster with compression) which could work to the benefit of both of you. Talalay latex over a dunlop core would also be well worth considering.
In reply # 4 in this thread, there are some sources in Austin that would be well worth considering … especially http://www.sleepworld.net/ who I have spoken with and know that they make a variety of all latex mattresses using both Dunlop and Talalay.
Hope this helps and if you have any questions regarding your testing … feel free to post them.
Phoenix