Buy it from a company that is service oriented.People who know their business,will fix anything that needs fixing,answer your call 24/7 and have people who will respond.Dealers who stand behind the product,know you by name and treat you like a long term customer.Keep up with service bulletins,install stuff right.Their are a few in every market ask around and find them. If you have the means change it all at the same time. The industry has driven everything in the same direction,its all pretty much the same technology now just arranged differently. You don't need a snake oil salesmen or fast talking slick salesmen....you need a problem solver with a work ethic and common sense and a set of morals.

And that applies to your doctor,lawyer,plumber,carpenter,preacher.....