Hi poteesh,
The first place I would start your research is the tutorial post here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how to avoid the worst ones so that hopefully this will be your last mattress purchase in a long time.
As you will see … I would tend to avoid all the major brands including Serta.
You can see some of my comments about Octaspring in post #2 here but I would be very cautious about buying any mattress based on any of the information in any commercial and I would make some very careful comparisons before considering it.
Once you get to step 3 in the tutorial … then the better options and possibilities in and around the Orlando area that I’m aware of are listed in post #2 here and there is also a forum list centered on Avon Park in post #5 here that may be helpful.
Phoenix