Hi ronfla,
The first two are foundations that would require a steel or wooden bedframe as well while the third one is a combination foundation and bedframe.
The wooden slat foundation would provide the most even support and there would be less risk of the mattress sagging into any gaps in the support surface because it has the largest load bearing surface area. The Simple Life foundation with a steel bedframe would probably be stronger and more supportive than the last one you linked (you can see some comments about these type of platform foundation/bedframes in post #10 here).
The “bottom line” though is that while any of them would be a suitable choice for your mattress … the risk in the longer term would be inversely proportional to the cost in the three options you linked.
Phoenix
PS: I can see that Jeff’s post was written while I was writing this one and that his thoughts are similar to mine :).