You can eliminate the Brentwwod Oceana, which contains memory foam...the worst upholstery material available, and what you already have in your Sleep Number Bed.
The Avocado mattress is closer in spec to the Natura Greenspring.
The differences that will matter down the road, is the very thin gauge wire throughout most of the mattress.
With the exception of the center third, the 16 and 17 gauge wire used is extremely thin.
The Natura uses 14.5 gauge throughout and the steel is twice tempered...not just once, as with the Avocado.
The other difference is the lesser expensive Dunlop latex. Natura uses Talalay latex.
The pricing is about the same.
Given the weight of your husband, the Natura should keep its shape better over the years...comparing the specifications of both lines.
But, at about the same price, the Natura Greenspring has the better specifications...especially for longevity under plus size people.
Of the 5 models, the Liberty Plush Eurotop is the most comfortable. It'll hold up, just fine, over the years.
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