Mr. Kenny,
Well, it depends how 'high-end' you want to go. We had excellent service out of 2008 Dynasty Roadmaster chassis over the 7.5 yrs. that we owned it (bought new and sold on Consignment in 2014).
Prevost chassis's are considered 2 million mile chassis's. Their parts, suspension and everything else, are very robust. Prevost chassis coaches have real front and rear bumpers and can withstand a pretty good hit without destroying the whole structure.
But, they need just as much maintenance to keep going but are built for easy/quick repairs. Windshields are about $450 each, radiators and CAC's are easy to get to as the grill on the side radiator opens for maintenance.
Just food for thought.
MM.