If you got to the local backpacking store you can try them all out. I know REI has a pretty good selection and you can try anything out. And you can always take it back if it doesn't work the way you wanted.
They also make inflatable pads that are very thick (with air anyway) to provide more comfort. The catch is, you have to inflate them yourself and they range between 1.5lbs to 2lbs for regular length. Here's a
link