You are talking about a new "set." Contemplating new appliance purchases can be fun. Can you save your present set? The reason I ask is that I find it nice to use my electric dryers unvented, with a supplemental lint catcher over the end of the vent hose, during the winter to add heat and some humidity to the house. I turn the HVAC system blower on for continuous operation to distribute the heat and humidity when drying clothes. If you could keep using your washer, you would have two washers, which is always better than one. Not only does it distribute the amount of use between two machines, but you also have a spare if, heaven forbid, something goes wrong with one of them. Do you have a garage that you could put the gas dryer in? That way, you could use it, vented, of course, in an unheated/uncooled space so that it would not draw the air that you have paid to heat or cool out of the house. The average vented dryer pulls about 150 cu. ft. of air per minute out of the house while in operation, something to think about if you are trying to save money on utilities.
The Cabrio with the agitator would be more satisfactory, in my opinion, especially with larger loads, than the models without one. The KA set is tried and proven technology, but WP eliminated the spray rinses in the washers a long time ago so I can't tell you that the washer will perform like the original models. If you like the windows, get the Cabrios.