Hi zen-sleep, welcome to the Mattress Underground 
- and welcome to Pittsburgh!
You have presented some interesting questions from your research in the site, but keep the basics in mind - any mattress you finally chose will be based on your Stats (height, BMI, sleeping position(s) and any underlying health condition - thanks for providing those! - and your PPP (Posture & alignment, Pressure relief, and Personal preferences). The good news is with your lower BMI you have a lot more options available that would be comfortable as well as supportive.
As you can see comparing the Mattress Specifications You Need To Know to the Mattress Durability Guidelines, latex is one of the most durable mattress materials you can find, and a well made latex mattress could last for many years. You say you sleep ‘hot’ - which memory foam mattresses are known to do, but you want to avoid a heavy bed…you may need to try any different bed types locally where you are if possible, to get a better idea of what types of mattress you do and don’t feel comfortable on, so you can make a ‘short list’ of compatible types. For your body profile, a latex or foam hybrid would provide adwequate support. While latex may be heavier, it really comes Soren to the total weight of the mattress, and how many layers of latex over what other components (for example, a latex hybrid with a 2"-3" comfort layer would of course be less heavy than a solid latex mattress). It comes down to personal preferences as far as what you definitely want and what you can do without on your new mattress.
As far as your list…these are mostly big box brands, and while they may be popular, their general lack of transparency in materials and densities of components make it impossible to assess either their suitability or durability for your sleep profile. They will not likely ‘hold up’ for the duration you want your mattress to last, and are subject to the ‘marketing hype instead of concrete specifications’ that you touched on during your research. Keep in mind, we suggest any foam in a potential mattress has no more than an inch or so of lower grade foams (for memory foam no lower than 4 lbs/cuft for normal range weights, and 5lbs/cuft for higher range weights) and if polyfoam is used, with at least 1.8 lbs/cuft density, just to ensure you have support. If you don’t see these specifications listed, it’s a good sign to avoid that mattress! Again, with your lower BMI, you have a lot more options to work with than a larger sleeper.
While your budget is not high, there are a number of Trusted Members of the site which carry foam hybrid mattresses in your range: you mentioned Nest Bedding, while GhostBed carries a number of foam hybrids, while Custom Sleep Technology has the Bronze, and Silver polyurethane modular mattresses you may also want to consider. Whichever Trusted Member of the site you choose, they ahave all been vetted for quality, transparency in materials and construction, excellent customer service and generous exchange and return policies. If you provide them with your Stats, PPP and mattress history, with what you want to achieve and your concerns, they can help you find a compatable mattressswhuch will provide many years of comfortable sleep. I wish you success on your new mattress journey, if you are curious about the suitability and durability of specific mattresses feel free to ask and we can comment on them…and good luck with your move to Pittsburgh!
~ Basilio