Buying a mattress is so hard. We got one last year and had to return the first Beautyrest and ended up with the Sealy Hybrid. LOVE LOVE it! It is half inner spring and half foam and the best of both worlds. Had it a year and still can't wait to go to bed at night into the just right firmness, and smoothness all the way across.
Read about the Saavta but didn't want to buy something I couldn't try out.
Good luck as this is quite a chore.