Hi moolee,
The SleepEz special is certainly a good quality/value choice and uses high quality materials.
Post #2 here has more about how to make comfort and design choices and if you aren’t able to test a mattress in person then the guidance and suggestions of a manufacturer is by far the best way to make a choice. They know more about which options are more likely to work well for different body types and sleeping styles based on “averages” than anyone else. their suggestion would be a “standard” layering for that mattress for someone of your weight and sleeping style.
They don’t offer the 5% discount on the SleepEz Special because it really is a low margin “special” and they only have a “pillow bonus”.
Phoenix