Mattress Forum

I am KILLING myself over this decision. I have to get a mattress ordered by Monday. After finally deciding that I want a latex mattress, I came across the Night Therapy 12" Latex mattress and it seems like a really good value. It has 7 inches of latex and a 5" core and 7 inches of latex in a Sealy costs $2000. 

The thing that worries me though is that all the Night Therapy latex mattresses say "Firm". I am wondering how firm that is. I weight 240 pounds and my last innerspring mattress broke down and I ended up having lower back pain.

The only reviews I can find for Night Therapy are for different models and most seem good.

Does anyone have any input in regards to Night Therapy latex mattresses in general? Also, has anyone experienced just how firm their firm really is?

Or is there some other equally priced and equipped Latex mattress that I should be looking at?

Thanks!