Does anyone out there have some good tips on buying a new mattress? Maybe the reason I've had poor luck is because I'm talking about mattresses on a car wash site, but I gotta start somewhere. The current one I have was the nicest one we found after driving around all day and laying horizontal in stores with people watching us. It seemed nice and comfy, but after sleeping on it for a few weeks, I woke up feeling like someone had smacked me with a baseball bat on the shoulder. Just how do you know that it will still be comfy months after you put out a grand ?