Why not a Serta?

You may check out Idle Sleep. They have a special offer right now where you can get a queen-size memory foam + 2 free pillows for $770 (The Idle mattress). They offer the longest free trial of all brands (18 months) and free returns if things don't work out. I have one for 3 months now. It easily antagonizes more expensive, premium brands.

If your budget is somewhat higher you may also check out the Comfy Standard. It has a strong and robust foundation with good edge support so that you won't sink, but also provides good pressure relief.

Puffy is another good alternative for musculoskeletal issues and is designed for all body types and sleeping positions.

/r/Mattress Thread