Having bought a Nash/Arctic Fox last summer, but not one of of the others, I would buy the AF. Due note that they may weigh a little more, but that's because of how solidly they build them which includes a lot more insulation in the roof to keep the sun heat out. I think they're the only TT MFG to build they're own frames.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.