If you're going to pay custom bucks for an adjustable sight installation and are concerned about durability, why not call Hamilton Bowen and see if he'd be willing to install one of his Rough Country sights? He makes 'em for Smiths, Rugers, etc., so I'd imagine he'd be able to do one up for your High Power.
Otherwise, either Colt or Ruger adjustable sights seem to provide a bit higher level of protection for the rear sight blade compared to S&W adjustables.
Best, Jon