Hi myarkin,
You can read the guidelines I use for memory foam mattresses in post #10 here.
The Lucid uses more than an inch of 3 lb memory foam which for me would exclude it.
You can read my thoughts about Dynasty in post #4 here (and the links it includes) and I would use the same guidelines. As you can see … I’m not sure how trustworthy their specs are.
With Sleep Innovations I would need to know the density and thickness of all the layers to make any meaningful comments but generally they also wouldn’t be my first choice.
Only your own personal experience can tell you how suitable a mattress is in terms of what I call PPP (Pressure relief, Posture and alignment, and Personal preferences) based on your own sleeping experience. No matter what you pay … if a mattress isn’t suitable for your needs and preferences then it would have little value to you. If you don’t have a chance to test a mattress first before you buy it … then the knowledge and experience of the merchant that is selling it and their ability to give you some guidance into making the most suitable choice for you (not for them) becomes very important.
Some of the better quality and value memory foam options that I’m aware of that may also be worth looking at and that are sold by manufacturers or retailers that have the knowledge and experience to give you some good guidelines are listed in post #12 here and IMO there is better quality/value available to you than any of the choices you are looking at.
Phoenix