I then added two nice wire crates on top of the drawer units. They are all light weight enough to take out when I need to haul some stuff w/out the dogs. All of this for a fraction of the cost of most systems.
The other unit I looked at was harder to take in and out since it was heavy, but not too pricey. You may want ot look at them though: http://www.huntingkennel.com
I bought a Deer Creek box. You can choose fro a number of different options. You can see their products at www.deer-creek.org. I live in Arkansas so insulation during hot weather was extremely important to me as well. I'd highly recommend their product.