I am building at the Taos Ski Valley in NM at 9,500 ft altitude. What brand and type of windows are best at this altitude?

I am interested in what others have to say as well as I'll be building at 9000 ft at Angel Fire near you.  I'm concerned that the highest altitude plant I have heard of is around 6000 feet.   That might still cause issues at our elevations.  I have thought about constructing them myself on site, at least the fixed ones.  Triple pane argon filled.  But I've got a lot research to do on that.

I know that you can't use argon at high altitudes. That is what I have learned thus far because the gas expands as to go to higher elevations.

What brand of metal clad wood windows have you had the best results from for cold climates?

Cone,

If the windows were made at high altitude, you could use argon, but I don't know what altitude differences would permit that.  e.g, would windows built in Denver (5000 ft) work ok at 9000 ft?  Or is that too much pressure difference?  That's one reason I'm thinking of making any fixed windows myself and adding argon on site.  But that doesn't solve the issue with the casements and Neowall that would be installed.