What is the best comforter to buy, that isn't hard but isn't too soft?

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I currently have a sealy pillow top mattress, but after the 2 or 3 years I have had it, it has continuously giving me back problems. It seems that the mattress is so soft that if i set on it for too long it leaves the indent for weeks. I love soft mattresses but them being so soft is giving back problems, what do you recommend?
 
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