Hi sanman,
These would all be the types of retailers that I would tend to avoid (see the guidelines here).
Assuming that they will provide you with the information you need about what is inside their mattresses (see this article), at MetroMattress the only mattresses I would consider would be their Therapedic mattresses, At SleepCity there is nothing listed on their website that I would consider, and I would be very cautious about anything at Citymattress as well and would make sure you know the type and quality of every layer in any mattress you are considering there and make some careful comparisons with other mattresses if you did decide to consider any of their mattresses. I would especially be cautious about their Pranasleep mattresses which are “mostly latex” but use fairly thick polyfoam quilting layers which could be a weak link in their latex mattresses and are also in a more premium budget range than other similar mattresses. As you know … I think highly of Jamestown Mattress and they would certainly be my priority if I was in the area.
If you do decide to go to Syracuse then the Syracuse list is in post #2 here. I think highly of Sleepmaster there as well and they would be a priority if I was in the Syracuse area.
An adjustable bed can certainly help with some sleeping issues. There is more about adjustable beds in post #3 here and the adjustable bed thread it links to.
You can read a little more about “why” I run this site and some of the history behind it in post #4 here. It took a few years to get there but the income from the site is now at the point where I can support my family … which is a “good thing” for any project that takes up an average of 16 hours a day 
Phoenix