Hi faby3003,
Did you talk with any of the other retail options listed in the Minneapolis list here?
Several of these have either memory foam or gel memory foam choices and would probably be worth including in your research for a memory foam / gel memory foam mattress.
As you mentioned … Tempurpedic does use good quality materials in their mattresses (except in their Simplicity line which uses low quality memory foam) but they are not good value when compared to other similar quality memory foam mattresses.
Phoenix