I have a Wayne-Dalton rollup that I installed a few years back. I like the look of it and it's good quality. I got the middle-of-the-road door that has a hard foam insulated shell on the inside. This gives it some thermal properties, but most inportantly, in my case, it adds rigidity to the door as opposed to the door with no backing at all. The high end one has the foam backing sandwiched between another layer of metal, and a higher R-value (insulation property rating) than the middle one. The extra metal backing also protects the foam backing from being nicked and gouged from use. (the foam backing is actually very hard, so even it can hold up pretty well by itself.) Unless you live in a region where it gets very cold, then the middle-of-the-road one is fine and saves you a few $$$
Hope that helps.