Hi a2dox,
FWIW … and you will see this in many of the reference posts I link to … when you look back on a mattress purchase when the time comes to replace it you will remember much more about how well you slept and how long you slept well than you will about the price you paid for it (although price of course will always be an important part of “value”) and since a mattress can have a bigger effect on your overall wellbeing than almost anything else you can purchase … I would generally suggest the highest quality mattress you can comfortably afford and where you can notice a meaningful difference in terms of PPP and all the other parts of your personal value equation that are important to you.
Phoenix