I heard that Tempur-pedic is best? But is expensive. Please before I buy a new mattress, I would appreciate feed back on the type and kind of mattress you have, and if it helps, your back, restfulness, health etc. Also I heard that coil matresses are bad for the alignment of your body? Also, for the least amount of money for the best mattress... I want advice from experience, not what ads, Comsumer Reports etc. say. Thanks so much!