Hi JDM,
As you know Beloit is one of the members here which means I think very highly of them and they are among the best in the industry in terms of quality, value, and service.
There are too many variables, unknowns, and personal preferences involved for anyone to choose a specific mattress for someone else based on “theory at a distance” though and your own personal testing for PPP (Posture and alignment, Pressure relief, and Personal preferences) using the testing guidelines in post #1 here is a much more effective way to choose a mattress that works best for you. They will also give you good guidance and information to help you find the most suitable mattress and about any strengths and weaknesses of all of their mattresses as well. They know their mattresses better than anyone else.
You can also read a little more about some of the many factors that can affect sleeping temperature in post #2 here which can help you with your choices as well.
You will be in good hands when you go there … they “know their stuff” 
Phoenix