Hi ajeckler,
I switched your post to its own topic so it’s easier to find and keep any related posts together.
There are too many unknowns, variables, and preferences involved for me to know which of their mattresses (or which mattress/topper combination) would be best for you in terms of PPP and your own personal testing would be the best way to assess this (see mattress firmness/comfort levels in post #2 here).
I also don’t know the specs of most of the mattresses at Sleep Country so I can’t really make any meaningful comments about them in terms of quality (if they can provide you with the information in post #4 here about any of their mattresses and you can post them here I’d certainly be happy to help you assess the quality of the materials and help you identify any potential weak links).
Having said that … post #2 here and the posts it links to has more information about the approach I would take if I was also caught “between a rock and a hard place” and needed to make a choice there when under normal circumstances I would be unlikely to choose any of them.
If the Oracle has the same specs as the Genius then there would be 2" of 1.3 lb “support foam” underneath the 2.75" of gel memory foam which is a very low quality/density material which can soften under the heavier parts of the body relatively quickly resulting in the loss of support. Some of the other iComfort mattresses may be better choices and have less lower quality materials in their design.
Phoenix