I have had excellent luck with Sterns and Foster. Learned a long time ago how to cross shop for mattresses. So you see one at Macy Bed that is called the "edgemont". They will price match with everywhere, but you can't find it anywhere. That's because the manufacturers work with retail and rename the same product. Bloomingdales has the same exact mattress, maybe different ticking, but its called the "edgemore". So impossible to cross shop. Also, typically, the higher in the alphabet, the more layer of padding and higher quality within the same brand. So the S&F edgemont, would not be as luxurious as the S&F "Langly". Best advice is go and lay on it, bounce up and down on the edge, etc. One thing I know for sure is that after having moved the same size S&F and a lesser Sealy, you could feel the better quality. The S&F had to weigh twice as much.
I've always gone to furniture clearance center, Carson Piere Scott, Macy's furniture clearance, or Bloomingdales furniture clearance, and bought one that had a delivery mishap, broken handle, dirt on a corner, slight rip in box spring. Huge savings, like 75% off and by the time you get it all covered with your bedding, no one will know.