Hi digitalpure,
With your height/weight … I would tend to avoid any memory foam product that used less than 5 lb memory foam and even then it is not likely to last as long as latex which in general is more durable than memory foam. I doubt that the mattress you are looking at would even make it to 5 years and would likely be considerably less. With heavier weights … I would pay particular attention to the quality/density of all the materials in your mattress and the knowledge and experience of the people you are buying from so they can give you good guidance and help you make the most suitable choices. The best value for latex tends to be local factory direct manufacturers in your area, better sleep shops that carry smaller local or independent brands, or online (which is a little riskier because you can’t test the mattress first). The online sources that I would recommend because of the quality/value of their mattresses and their ability to give you the best possible guidance are listed in post #21 here. They are all invited members of this site which means that I believe they are among the best quality/value in the country.
The first post in this thread has a step by step process that can help you find the best quality and value mattress and eliminate most of the worst choices so you can focus more on the best.
If you let me know the city or zip you live in I’d be happy to let you know of any local manufacturers or better retailers in your area I’m aware of.
Phoenix