Hi aznkorboi,
Out of the three mattresses you linked I would avoid both of the Spring Air mattresses but the Sequoia uses good quality materials that are suitable for your weight range and since Costco has a great return policy (so can try the mattress to make sure you sleep well on it without any risk) it would certainly be worth considering.
All the major brands such as Sealy/Stearns & Foster, Simmons, and Serta all tend to use lower quality and less durable materials in their mattresses than most of their smaller competitors that will tend to soften or break down prematurely relative to the price you pay which is why I would generally suggest avoiding all of them completely (along with most of the retailers that focus on them as well) regardless of how they may feel in a showroom along with any mattress where you aren’t able to find out the type and quality/durability of the materials inside it (see the guidelines here along with post #3 here and post #12 here and post #404 here).
I’m looking forward to finding out what you end up deciding.
Phoenix