A new bed

Our bed is finally wearing out. I wonder how long a bed is suppose to last. Two overweight people spending at least 7-9 hours a night on it for 11 years sure did wear it down fast. So we had a discussion on what type of bed do we really want to get. I was all for getting a water bed again, since that is what we first had before this bed, while hubby wants us to look into a memory foam bed. There happened to be a local memory foam mattress sale and we went. Whoa, are those things expensive! It looks like we might be getting that water bed again, yippee!