Yes New horizons, Excel, Mobile suites aqre all high end full time units.
Montanna, Alpine, Big Horn, Jayco's Pinnacle etc are all high end consumer grade units. And yes, many RV'ers live in them full time but no way do they have the overall quality build of the above units.
Whatever you buy, make sure you have enough truck to handle. Also, research your axles and tires versus your trailer weight to ensure you have an adequate cushion weight. Overloaded trucks and trailer axles lead to on the road issues that are not plesant to deal with!