Hi! I am new here and looking for a mattress for my 18yo daughter. She has chronic joint pain (hip, neck, knees) and is a stomach and side sleeper. She is 5’9", 140#. She prefers a soft-medium feel but is supportive. She would also like an adjustable base. She tried a Sealy Postuperpdic Plus Hybrid Plush and fell in love although found it didn’t support her back in the sitting position. She also really like Tempur-pedic Adapt Hybrid but I am concerned about the price and quality and feel like there are better options than both of those. Any suggestions?