Finding a well-built rig

Owning an Arctic Fox, our next one was going to be another Arctic Fox. That was until I got talked into looking at an Excel. They are probably built better than our AF. The salesman kept saying, but does yours have this, (furnace heated tanks, strong frame, real fiberglass insulation etc.) and we kept saying yes. But then he said, "It sounds like you have a real good one. This brand is guaranteed to -10 degrees." I had to say, OK, lets look. I was very impressed. Now I am leaning towards Excel, but if Arctic Fox comes up with a floor plan we like better before we buy, we will go with another AF.

Edit: The Arctic Fox is heavy for its size. The weight is not from glitz, strength isn't light.