I personally love the firmest mattress possible. I want to feel like I am sleeping on the floor, but without the discomfort of solid ground.

I made the mistake a few years ago of getting on of those compressed box mattresses. Exta firm means nothing.

Follow up question: Any advice on buying a mattress? I have a Costco membership so I will probably buy it there. Still, I am on the lookout for alternative materials and construction that could make sleeping better. I finally installed blackout curtains and they are awesome.