Hi primasilva,
dn has made the same comments that I would have made (thanks dn :)) and the steps and links in the tutorial post will give you the highest odds of making the best possible choice ,… and of course avoiding the worse ones in terms of quality and value.
as dn also mentioned … I’d be happy to let you know of any of the better options or possibilities in your area I’m aware once I know your city or zip.
Unfortunately a topper won’t usually “fix” a mattress where the comfort layers have softened or impressed (or were too soft in the first place) because the foam layers would need to be replaced instead of using more foam on top of them. There is more about this in post #4 here.
The iComfort Prodigy mattress is a memory foam mattress that has a thin layer of latex and couldn’t reasonably be called a latex mattress or even a latex hybrid. Each mattress is unique and unless a mattress is exactly the same in all the layers (which isn’t likely) or specifically designed and advertised as a reasonable approximation for another mattress (and the comparison is an accurate description and not just marketing) then only your own personal testing can know which mattress feels like another one because the comparison would be subjective and based on your own perceptions. There is more about matching one mattress to another in post #9 here.
Phoenix