Hi ajd6c8,
The Essence uses high quality materials (blended Talalay and Talalay GL fast response) so if your careful and objective testing confirms that it’s a good match for you in terms of PPP and it’s also the best match for the parts of your personal value equation that are most important to you compared to the other finalists you are considering then it would certainly make a good choice.
You can see my thoughts about a solid surface foundation in post #10 here. Unless there was a compelling reason to choose otherwise (such as wanting an adjustable bed which has a solid surface) I would tend to choose a firm non flexing slatted support surface with gaps between the slats of no more than 3" for a latex mattress. There is more about the types of support systems that generally work best for different types of mattresses in the foundation post here and the posts it links to.
Healthy Back isn’t a manufacturing or retail member of the site (the membership list is here) so they don’t provide a discount or bonus to members of the forum.
Phoenix