All the manufactures mentioned produce a very good coach that are generally suitable for potential full time living. Ratings can be a bit subjective. What might work well for some might not be a feature other consider necessary. Since your search has you looking at used rigs construction methods and material play a roll but prior owner maintenance routeen will have a much greater effect. A 10 year coach that has been well maintained might in better condition than a four year that was used once and has been parked ever since. As such going just by a rating might not serve you best since its very rare to find a coach that has been review several years after the initial review.
The ratings guide has helped you narrow down potential builders and product lines. At this point you might be best served by getting out and start kicking tires. Narrow down the general floor plan and features you want. Be prepared to fly half way across the country to look at a potential coach but if you don't feel right about it just walk away. Put the wife in charge of the interior while you concentrate on the chassis, exterior and mechanical systems.
Good luck and have fun searching.
